Calvert County, MD
 
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§ 104-18 General specifications.

A. 
All materials specifications, methods of construction, and methods of measurement shall be in accordance with the current "Specifications for Materials, Highways, Bridges and Incidental Structures," State of Maryland, as amended from time to time.
B. 
All road design criteria shall be in accordance with the current AASHTO "A Policy on Geometric Design of Highways and Streets," and "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures."
C. 
Where not specifically covered by this chapter, materials and construction methods shall be based on the appropriate "State of Maryland, Department of Transportation, State Highway Administration, Standards and Specifications," with all current errata and addenda.
D. 
Design speed shall be 10 miles per hour over the posted speed limit (existing or proposed).

§ 104-19 Road classification.

A. 
Roads are classified according to the intended use and potential traffic capacity requirements. The right-of-way and pavement widths shall be consistent for the entire road as defined in RD-11 and RD-11A of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures."
B. 
Classifications assigned to roads are as follows:
(1) 
Residential/Local Roadway - RD-1 Category.
(a) 
The designation of RD-1A shall apply to:
[1] 
A private road intended to serve and provide access exclusively to the properties abutting thereon, including, but not limited to, family conveyance subdivisions, subdivisions recorded prior to the adoption of the Calvert County Zoning Ordinance (CCZO), July 29, 1967, Rural Community Districts and Farm and Forest Districts.
[2] 
The minimum right-of-way width is 20 feet.
[3] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-1A shall be used.
(b) 
The designation of RD-1B shall apply to:
[1] 
A private lane intended to serve a maximum of five lots and provide access exclusively to the properties abutting thereon.
[2] 
The minimum right-of-way width is 30 feet.
[3] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-1B shall be used.
(c) 
The designation of RD-1C shall apply to:
[1] 
A private alley intended to provide access exclusively to the properties abutting thereon.
[2] 
The placement or construction of any item that obstructs pedestrian or vehicular access within an alley is prohibited.
[3] 
No fixed structures of any kind, such as sheds or fences, or portions thereof shall be constructed within the alley right-of-way.
[4] 
An alley right-of-way within a newly recorded subdivision is generally owned and maintained by a property owners' association. Existing platted alley rights-of-way in existing subdivisions may be owned by an existing property owners' association, the owner/developer of the subdivision, or by the County.
[5] 
The entity responsibly for maintenance of an alley right-of-way shall ensure the alley remains in a safely passable condition. Maintenance shall include, but is not limited to, mowing, litter pickup, and trimming and removal of all trees, vegetation and shrubs within the alley right-of-way.
[6] 
No maintenance is provided in any County-owned unimproved rights-of-way or alleys.
[7] 
An alley right-of-way may be used for installation of underground utilities.
[8] 
The minimum alley right-of-way width is 20 feet.
[9] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-1C shall be used.
(2) 
Residential/Local Roadway - RD-2 Rural Category shall apply to:
(a) 
A public road intended to serve and provide access exclusively to the properties abutting thereon.
(b) 
The right-of-way is an existing, recorded thirty-foot to forty-foot-wide reserved area serving existing recorded lots.
(c) 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-2 shall be used.
(3) 
Residential/Local Roadway - RD-3 Category. The Director's prior approval is required for use of this type.
(a) 
The designation of RD-3A - Rural shall apply to:
[1] 
A public road intended to serve and provide access exclusively to the properties abutting thereon within newly created subdivisions serving six to 10 lots, or the right-of-way is an existing recorded forty-foot to fifty-foot-wide reserved area serving existing recorded lots.
[2] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-3A shall be used.
(b) 
The designation of RD-3B - Urban shall apply to:
[1] 
A public road intended to serve and provide access exclusively to the properties abutting thereon within newly created subdivisions serving six to 10 lots, or the right-of-way is an existing recorded forty-foot to-fifty-foot-wide reserved area serving existing recorded lots.
[2] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-3B shall be used.
(c) 
The designation of RD-3C - Urban shall apply to:
[1] 
A public one-way roadway intended to serve and provide access exclusively to the properties abutting thereon within newly created subdivisions serving six or more lots. Minimum right-of-way width shall be 30 feet.
[2] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-3C shall be used.
(4) 
Residential/Local Roadway - RD-4 Category.
(a) 
The designation of RD-4A - Rural shall apply to:
[1] 
A public road intended to serve and provide access exclusively to the properties abutting thereon within newly created subdivisions.
[2] 
It serves up to 50 dwelling units with a right-of-way width of 50 feet.
[3] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-4A shall be used.
(b) 
The designation of RD-4B - Urban shall apply to:
[1] 
A public road intended to serve and provide access exclusively to the properties abutting thereon within newly created subdivisions.
[2] 
It serves up to 50 dwelling units with a right-of-way width of 50 feet.
[3] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-4B shall be used.
(c) 
The designation of RD-4C - Urban, On-Street Parking, One Side of Road shall apply to:
[1] 
A public road intended to serve and provide access exclusively to the properties abutting thereon within newly created subdivisions.
[2] 
It serves up to 50 dwelling units with a right-of-way width of 50 feet.
[3] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-4C shall be used.
(d) 
The designation of RD-4D - Urban, On-Street Parking, Both Sides of Road shall apply to:
[1] 
A public road intended to serve and provide access exclusively to the properties abutting thereon within newly created subdivisions.
[2] 
It serves up to 50 dwelling units with a right-of-way width of 50 feet.
[3] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-4D shall be used.
(5) 
Minor Residential Collector Roadway RD-5 Category.
(a) 
The designation of RD-5A - Rural shall apply to:
[1] 
A public road serving 51 to 150 lots within a newly created single-family subdivision which, in addition to providing access to properties abutting thereon, accommodates the movement of traffic from lower- to higher-classification roads. The section of roadway serving the 51 to 150 lots shall be designed to this standard. Roadways accessing this roadway may be built to this standard or to RD-4 standards at a minimum.
[2] 
The right-of-way width is 50 feet.
[3] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-5A shall be used.
[4] 
Roadway width requirements are based on number of lots served.
(b) 
The designation of RD-5B - Urban shall apply to:
[1] 
A public road serving 51 to 150 lots within a newly created single-family subdivision which, in addition to providing access to properties abutting thereon, accommodates the movement of traffic from lower- to higher-classification roads. The section of roadway serving the 51 to 150 lots shall be designed to this standard. Roadways accessing this roadway may be built to this standard or to RD-4 standards at a minimum.
[2] 
A private road intended to serve as the principal residential roadway within a townhouse or multifamily development of 100 to 150 units.
[3] 
A private road servicing uses open to the general public.
[4] 
A private road that provides through traffic.
[5] 
The right-of-way width is 50 feet.
[6] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-5B shall be used.
(c) 
The designation of RD-5C - Urban, On-Street Parking, One Side of Road shall apply to:
[1] 
A public road serving 51 to 150 lots within a newly created single-family subdivision which, in addition to providing access to properties abutting thereon, accommodates the movement of traffic from lower- to higher-classification roads. The section of roadway serving the 51 to 150 lots shall be designed to this standard. Roadways accessing this roadway may be built to this standard or to RD-4 standards at a minimum.
[2] 
A private road intended to serve as the principal residential roadway within a townhouse or multifamily development of 100 to 150 units.
[3] 
A private road servicing uses open to the general public.
[4] 
A private road that provides through traffic.
[5] 
The right-of-way width is 50 feet.
[6] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-5C shall be used.
(d) 
The designation of RD-5D - Urban, On-Street Parking, Both Sides of Road shall apply to:
[1] 
A public road serving 51 to 150 lots within a newly created single-family subdivision which, in addition to providing access to properties abutting thereon, accommodates the movement of traffic from lower- to higher-classification roads. The section of roadway serving the 51 to 150 lots shall be designed to this standard. Roadways accessing this roadway may be built to this standard or to RD-4 standards at a minimum.
[2] 
A private road intended to serve as the principal residential roadway within a townhouse or multifamily development of 100 to 150 units.
[3] 
A private road servicing uses open to the general public.
[4] 
A private road that provides through traffic.
[5] 
The right-of-way width is 50 feet.
[6] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-5D shall be used.
(6) 
Residential Collector Roadway RD-6 Category.
(a) 
The designation of RD-6A - Rural shall apply to:
[1] 
A public road intended to serve and provide access to newly created single-family subdivisions with more than 150 lots. The section of roadway serving these lots shall be designed to this standard. Roadways accessing this roadway may be built to this standard or to RD-4 or RD-5 standards, depending on the number of lots the roads serve.
[2] 
The minimum right-of-way width is 60 feet.
[3] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-6A shall be used.
(b) 
The designation of RD-6B - Urban shall apply to:
[1] 
A public road intended to serve and provide access to newly created single-family subdivisions with more than 150 lots. The section of roadway serving these lots shall be designed to this standard. Roadways accessing this roadway may be built to this standard or to RD-4 or RD-5 standards, depending on the number of lots the roads serve.
[2] 
A private road intended to serve as the principal residential collector roadway within a townhouse or multifamily development of greater than 150 units.
[3] 
A private road servicing uses open to the general public.
[4] 
A private road that provides through traffic.
[5] 
The minimum right-of-way width is 60 feet.
[6] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-6B shall be used.
(7) 
Minor Collector Roadway RD-7 Category.
(a) 
The designation of RD-7A - Rural shall apply to:
[1] 
A public road which primarily accommodates the movement of traffic from lower-classification roads to the arterial network and links major land uses and traffic generators of County significance to the arterial network, serving average daily traffic (ADT) volumes greater than 2,000 vehicles per day.
[2] 
The right-of-way width is a minimum of 60 feet.
[3] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-7A shall be used.
(b) 
The designation of RD-7B - Urban shall apply to:
[1] 
A public road which primarily accommodates the movement of traffic from lower-classification roads to the arterial network and links major land uses and traffic generators of County significance to the arterial network, serving average daily traffic (ADT) volumes greater than 2,000 vehicles per day.
[2] 
The right-of-way width is a minimum of 60 feet.
[3] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-7B shall be used.
(8) 
Commercial and Industrial Roadways RD-8 Category.
(a) 
The designation of RD-8A - Rural shall apply to:
[1] 
A public road which primarily provides access to and within a commercial or industrial area.
[2] 
The right-of-way width is a minimum of 60 feet.
[3] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-8A shall be used.
(b) 
The designation of RD-8B - Urban shall apply to:
[1] 
A public road which primarily provides access to and within a commercial or industrial area.
[2] 
The right-of-way width is a minimum of 60 feet.
[3] 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-8B shall be used.
(9) 
The designation of Major Connector - RD-9 Category shall apply to:
(a) 
A public road which primarily accommodates the movement of traffic to and from the arterial network serving average daily traffic (ADT) volumes greater than 4,000 vehicles per day.
(b) 
The right of way width is a minimum width is 64 feet without median or 80 feet with median.
(c) 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-9 shall be used.
(10) 
The designation of Town Center Boulevard Roadway - RD-10 shall apply to:
(a) 
A public road which primarily accommodates the movement of traffic between commercial and residential development within Town Centers.
(b) 
The right of way width is a minimum width 83 feet.
(c) 
When approved under provisions of the Zoning Ordinance or Subdivision Regulations, Plate RD-10 shall be used.
(11) 
The designation of Common Access Driveway (Private) - RD-16 shall apply to:
(a) 
A private access area.
(b) 
A minimum of 50 feet and a maximum 75 feet wide by a minimum of 50 feet and maximum of 75 feet long, commonly owned and privately maintained by adjoining lot owners.
(c) 
Created to provide access to three to five residential lots.
(d) 
Plate RD-16 shall be used.
(e) 
When a common access driveway accesses a collector road, the use of a modified transition lane/deceleration lane (RD-18A) shall be used.

§ 104-20 Design standards.

A. 
Roadway typical sections.
(1) 
Typical road design and construction shall be as depicted on plates contained in "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures."
(2) 
Any variance to these typical sections shall be approved by the Director.
B. 
Minimum pavement sections.
(1) 
Minimum pavement sections shall be consistent for the entire road section as defined on Plates RD-12 and RD-12A of the "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures."
(2) 
The pavement depth requirements are minimum standards. Variances to these typical sections may be required by the Director due to, but not limited to, soil conditions, traffic loading, or frost level.
(3) 
Any variance to the minimum standards requested by the permittee shall be approved by the Director. The proposed typical section shall meet the pavement design criteria per AASHTO or comparable criteria as submitted by the engineering professional representative or a geotechnical representative.

§ 104-21 Roadway geometry.

A. 
Horizontal alignment.
(1) 
Traffic way center lines within a curve shall be connected by a horizontal curve with a minimum radius, as shown in Plates RD-11 and RD-11A of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures," when the center line changes direction by more than 30 minutes. The Director may approve a variance to this condition on a case-by-case basis when required by unusual or special conditions.
(2) 
Horizontal curve data shall be computed by the arc definition of a circular curve.
(3) 
A tangent of a least 100 feet shall be used between reverse curves.
(4) 
Tangents should not be introduced between two curves in the same direction unless the length of the tangent is greater than 500 feet.
B. 
Vertical alignment.
(1) 
Finished road grades shall be in accordance with the following standards:
(a) 
Roads shall be designed and constructed so that finished grades do not exceed 8% for collector and commercial roads and 10% for residential roads and common access drives. No grade shall be less than 1%. The maximum grade in a cul-de-sac shall not exceed 6%. The maximum grade in a roundabout shall not exceed 4%.
(b) 
Gutter grades on concrete and paved gutters shall be not less than 1%.
(c) 
Vertical changes in road grades of more than 1% shall be connected by vertical curves with a minimum length of 100 feet.
(d) 
Tabulation of vertical standards is shown on Plates RD-11 and RD-11A of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures."
(e) 
Standard landing requirements for residential or collector roads, common access drives, shared driveways, or private lanes intersecting a residential or collector road are shown on Plate RD-11B of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures" and shall conform to the following:
[1] 
For grades less than 5.5%:
[a] 
A one-hundred-foot vertical curve shall be used with the point of vertical curvature (PVC) beginning at the edge of shoulder to the point of vertical tangency (PVT) of the proposed road/lane/drive.
[b] 
Maximum upslope from the edge of shoulder shall be 1%. Maximum downslope from edge of shoulder shall be 2%.
[c] 
Algebraic difference shall not exceed 5% for residential or collector roads. Algebraic difference shall not exceed 10% for common access drives, shared drives and private lanes.
[2] 
For grades between 5.5% and 10% (15% for private lanes and shared drives):
[a] 
A twenty-five-foot-long landing grade shall be provided from the edge of shoulder, with the point of vertical curvature (PVC) beginning at the terminus of said landing grade for the proposed road/lane/drive.
[b] 
A two-hundred-foot vertical curve shall be used for slopes between 5.5% and 7%. For grades between 7.01% and 10%, a two-hundred-fifty-foot vertical curve shall be used.
[c] 
Maximum upslope from the edge of shoulder (including landing grade) shall be 3%. Maximum downslope from the edge of shoulder (including landing grade) shall be 2%.
[d] 
Algebraic difference shall not exceed 10% for residential, collector roads, common access driveways, shared drives and private lanes.
[3] 
Any deviation from design standards shall be on a case-per-case basis and shall be requested in writing and approved by the Director.
(f) 
Vertical curves shall meet the minimum rate of curvature (K) based on stopping sight distance per AASHTO.
(g) 
The Director may approve a variance of not more than 10% of the standard specified maximum grade where required by unusual topographic situations and where public safety shall not be compromised.

§ 104-22 Road intersections.

A. 
Minimum intersection sight distances shall be provided at all intersections of existing County and proposed subdivision roads per AASHTO.
B. 
Minimum stopping sight distances shall be provided at all intersections of interior subdivision roads per AASHTO. No proposed road shall be permitted to intersect an existing County road at a location that would result in undue interference with or hazard to the free movement of normal traffic.
C. 
The radii of traffic curbs and pavement edges at intersections shall be shown on the plans and governed by the following criteria:
(1) 
At an intersection of residential roads, or of a residential road with a collector road, the radius of the returns shall be 25 feet to face of curb, or 35 feet to edge of pavement where no curbs are provided.
(2) 
At an intersection of collector roads, the radius of the returns shall be 30 feet to face of curb, and 35 feet to edge of pavement where no curbs are provided.
(3) 
When any of the aforesaid road intersections involve the intersection of a curbed traffic way with a noncurbed traffic way, the radius of the returns shall be 35 feet.
(4) 
At an intersection into a commercial/industrial subdivision, the radius of returns shall be a minimum 50 feet to face of curb.
(5) 
Where conditions warrant, i.e., intersection geometry and design vehicle issues, the use of three centered (compound) curves may be allowed, subject to the Director's approval.
(6) 
The Director will consider the use of smaller entrance radii upon satisfactory evidence from the engineer that the proposed entrance will provide unrestricted access to the largest delivery vehicle that will serve the site. The largest vehicle considered is a WB-67 unless otherwise specified by the Director.
D. 
Center lines of traffic ways shall continue through intersections without offset and shall intersect as nearly as possible at right angles. Where various conditions make a right-angle intersection impracticable, the minimum deflection angle between the center line of a residential road and the center line of any other road shall be 70°, and the minimum deflection angle between the center line of a collector road and the center line of another collector road shall be 75°.
E. 
The minimum offset between center lines of public and/or private roads shall be 200 feet. The minimum offset between a public road and a commercial entrance shall be either 150 feet measured between their respective center lines, or 125 feet from the edge of pavement along the public road to the edge of pavement along the commercial entrance, whichever is greater.
F. 
Driveway entrances are not permitted within intersection fillets and shall be offset a minimum of 60 feet from fillet to fillet.
G. 
The design of the intersection should be such that a clear line of sight shall be provided continuously within the triangle formed by the following three points:
(1) 
Intersection of center lines.
(2) 
Location shall be:
(a) 
Fifteen feet back of the edge of the travel way on gravel roads and roads without paved shoulders at the proposed intersection location.
(b) 
Fifteen feet back of the edge of paved shoulders on roads with paved shoulders at the proposed intersection location.
(c) 
Fifteen feet back of the edge of acceleration and deceleration lanes on roads having these at the proposed intersection location.
(3) 
Minimum intersection sight distance measured from the intersection and along the roadway center line to meet criteria as described in AASHTO. Easements required to obtain sight distance shall be provided and recorded on the record plat.
(4) 
Visibility at intersections. On a corner lot in any zoning district, nothing shall be constructed, erected, placed or allowed to grow in such a manner as to obstruct vision between a height of 2 1/2 feet and eight feet in height above the center-line grades of the intersecting streets in the triangular area formed by extending the street lines (curblines) of such corner lots to a point of intersection, then measuring back from this point of intersection along each street a distance of 25 feet to a point, then connecting these two points with a base line to form an isosceles triangle. Some objects may be exempt, provided the sight distance is adequate as determined by the Department.
H. 
Intersections with County collector and arterial roads shall be kept to a minimum during the planning and layout of subdivisions and individual lots. No more than 100 lots are to be accessed by a single subdivision entrance. All intersections with state roads shall conform to standards of the MSHA.
I. 
Geometric features such as transition, acceleration, deceleration, channelization, and bypass lanes at an entrance to, or within, a proposed development shall be required for roadways intersecting a collector road. Use of these features shall be based upon the ultimate size of the proposed development and the potential function of the roads.
J. 
A twenty-five-foot minimum filleted truncated shall be provided at all road intersections.

§ 104-23 Design speed.

All roads shall be designed and constructed for the design speed of the road. The design speed shall be 10 miles per hour over the posted speed limit, or as determined by the Director. If the roadway is not posted, according to Maryland State law, the speed limit of the roadway is 30 miles per hour.

§ 104-24 Superelevation.

A. 
Roads shall be superelevated in accordance with AASHTO standards.
B. 
To superelevate, pavements shall be rotated around the center line, except where such procedure would adversely affect adequate drainage design. To avoid such a situation, the engineering professional representative may rotate the superelevation around the inside or outside edge of pavement, whichever affords the best drainage design.
C. 
Whenever possible, 2/3 of the transition shall be accomplished on tangent, and the remaining 1/3 shall be accomplished on the curve.
D. 
Horizontal curves of roads in subdivisions, commercial and industrial areas are not generally superelevated. The use of superelevated roads in these areas shall be approved by the Director.

§ 104-25 Culs-de-sac and tee-turnarounds.

Standard details for culs-de-sac and permanent and temporary tee-turnarounds are shown on Plates RD-17A, RD-17B, RD-17C, RD-17D, and RD-17E.
A. 
Culs-de-sac.
(1) 
The radius of the paved circular portion shall be determined per Plate RD-17C, RD-17D, or RD-17E.
(2) 
The minimum length of the cul-de-sac road shall be 400 feet. The maximum length of the cul-de-sac road shall be 1,600 feet.
B. 
Tee-turnarounds.
(1) 
If a road, designed as a temporary dead-end road, is to be extended at a future date, a temporary tee-turnaround shall be used in place of a cul-de-sac. The length of the turnaround, or "T" portion, shall be equal to the width of the right-of-way. Barricades and/or special end treatments may be required on a case-by-case basis as directed by the Director.
(2) 
Permanent tee-turnarounds shall be restricted to subdivisions serving a maximum of 10 lots or as approved by the Director.

§ 104-26 Residential driveways.

A. 
Residential driveways shall be constructed in accordance with Plates RD-15A, RD-15B, and RD-15C of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures" as minimum requirements. The developer shall construct the driveway under a grading permit.
(1) 
A maximum landing grade of 8% from the edge of the shoulder to the right-of-way line is permissible. The maximum grade of driveways shall be 15%.
(2) 
Driveways serving individual lots shall be constructed to a minimum width of 10 feet, and final surface for all residential driveways shall be constructed to a minimum thickness of four inches of compacted CR-6 or approved equal. Driveway material shall be noted on plans submitted for approval.
(3) 
Shared driveways serving two lots shall be constructed to a minimum width of 12 feet with the travel way constructed to a minimum thickness of four inches of compacted CR-6 or approved equal.
(4) 
Shared driveways accessing three or more lots that are served by platted easement areas shall be constructed to a minimum width of 16 feet with the travel way constructed to a minimum thickness of four inches of compacted CR-6 or approved equal. This standard does not apply to newly platted lots served by a private lane.
(5) 
Concrete driveway aprons are not acceptable within public rights-of-way for open-section roadways. Concrete aprons are acceptable in closed-section roadways.
(6) 
All shared driveways shall require a recorded shared maintenance agreement approved by the County Attorney.
B. 
Driveway entrances to properties shall be constructed according to the standard driveway design.
(1) 
Driveway aprons shall not be constructed in, or partially in, any intersection fillet.
(2) 
All driveway entrances shall meet AASHTO sight distance criteria and be certified thereto. In some cases, grading improvements shall be necessary to conform to these standards. If, upon completion of all feasible grading improvements, it is found that the lot still does not meet the minimum sight distance criteria, the driveway entrance shall then be placed to attain the optimum sight distance as approved by the Director.
(3) 
The end of the driveway flare at the edge of paving shall not extend beyond the perpendicular projection from the edge of paving to the property corner at the right-of-way.
C. 
Residential lots shall be limited to one driveway entrance onto County roads.
D. 
An on-site turnaround area is recommended for driveways on lots of 1/2 acre or greater.
E. 
Entrance pipes shall be designed at the lowest point of a lot at the road right-of-way.

§ 104-27 Commercial entrances.

Commercial and industrial entrances shall be constructed in accordance with MSHA standards or as shown on Plate RD-13B.

§ 104-28 Drainage.

A. 
Every roadway and residential subdivision shall be provided with storm drains, culverts, drainage ways, or other means of conveyance adequate to collect and dispose of all water originating on or flowing across the roads and property without inundating or damaging roads, lots, or other properties.
B. 
Drainage facilities shall be designed in accordance with Part 4, Storm Drainage Design Criteria, of this chapter.
C. 
All state and County erosion and sediment control requirements shall be strictly complied with at all times during construction.
D. 
Floodplain district. Development of designated floodplain areas designated by mapping or elevation shall be restricted to the uses specified in the County Zoning Ordinance and in accordance with erosion and sediment control plans approved by the United States Department of Agriculture/NRCS.

§ 104-29 Cross-section elements.

A. 
Embankment.
(1) 
Embankment shall be formed of suitable material obtained from roadway, structure, borrow and other excavation, and it shall be placed, processed and compacted to the lines and grades shown on the plans and in accordance with Section 204 of the Maryland Department of Transportation, State Highway Administration, Standard Specification for Construction and Materials.
(2) 
For areas where embankment is to be made three feet or more in depth, trees and stumps shall be cut off as close to the existing ground as is practical, but not to exceed 12 inches above the ground surface. Near the toe of embankment slopes, none of the stumps or trees shall extend above a point one-foot beneath the slope surfaces. In addition, brush, rubbish, debris, and wood shall be removed prior to placement of fill.
(3) 
For areas where embankment is to be made less than three feet in depth, all trees, stumps, roots, brush, matted roots, and debris shall be removed, grubbed, or blasted from the existing ground prior to placement of fill and disposed of at an approved facility. In the event that the embankment is two feet or less in depth, these materials shall be grubbed in the same manner required where excavation is to be made.
(4) 
Within areas to be excavated, said areas shall be cleared and grubbed. All imbedded stumps, root mats, etc., shall be removed to a depth of not less than one foot below the subgrade or slope surfaces. All depressions made below the subgrade or slope surfaces by the removal of stumps or roots shall be refilled with materials suitable for embankment and shall be compacted in conformity with the requirements of this chapter.
B. 
Subgrade.
(1) 
This work shall consist of the preparation, protection, and maintenance of the subgrade prior to the construction of succeeding courses in accordance with the current Maryland Department of Transportation, State Highway Administration Standard for Construction Materials.
(2) 
All soft and unstable material and any other portions of the subgrade that shall not properly compact shall be removed, disposed of, replaced with suitable material, and compacted. The material shall be proof-rolled and approved by the inspector before subsequent material is placed.
(3) 
After roadway excavation and embankments have been completed, the subgrade shall be fine graded and compacted.
C. 
Subbase. Subbase shall be placed in accordance with Section 3 (Road Standard Detail Plates and Pavement Section Plates RD-12 and RD-12A).
D. 
Base and surface pavement. Base and surface pavement shall be placed in accordance with Section 3 (Road Standard Detail Plates and Pavement Section Plates RD-12 and RD-12A).
E. 
Sidewalks.
(1) 
Sidewalks may be required where standard combination curb and gutter is built and where otherwise considered necessary by the Director or where required by the Calvert County Zoning Ordinance or Town Center Zoning Ordinance.
(2) 
Maintenance agreements are required for all sidewalks proposed within a public right-of-way. Grants of perpetual easement to the public and maintenance agreements shall also be provided for sidewalks adjacent to but outside a public right-of-way when the sidewalks are for public use.
(3) 
Sidewalks in residential areas shall be a minimum of five feet in width as shown on Plates RD-20A and RD-20B, unless otherwise specified by the Director.
(4) 
Along open-section roadways, sidewalks shall be located a minimum of 10 feet off the edge of pavement.
(5) 
Sidewalks are to be portland cement concrete, MSHA Mix No. 3, Section 902.10.03, reinforced with 6 x 6 10/10 W.W. Mesh (6 x 6 W 1.4/W 1.4), unless otherwise required in the Town Center Zoning Ordinance, constructed over six inches' minimum of graded aggregate base.
(6) 
Sidewalk geometry and traffic way crossings shall be designed to meet or exceed the minimum requirements put forth by the current Americans with Disabilities Act standards.
F. 
Road signs. Road name, regulatory, warning, and guide signs shall be erected by the developer on all County roads. These signs shall show direction, warning, and road names of intersecting roads and shall comply with the current issue of the MUTCD. All private road name signs shall have a blue background with white letters to illustrate a non-County-maintained road.
G. 
Traffic barriers.
(1) 
Traffic barriers with proper signage shall be erected on all new roadways at points of extreme hazard to a vehicle leaving the traveled portion of the traffic way and at the end of permanent or temporary tee-turnarounds. Generally, potential hazards develop at fills over eight feet in vertical depth from the edge of the shoulder to the toe of the slope when the slope ratio is steeper than 4:1 and for fills greater than 15 feet regardless of slope. Traffic barriers and other end-of-road treatments may also be required at other locations at the discretion of the Director.
(2) 
Traffic barriers shall be placed as shown with typical roadway sections. The type of traffic barrier to be used shall be traffic barrier W beam. Where traffic way construction ends in fill areas, traffic barrier W beam barricades shall be erected.
(3) 
The State of Maryland, Department of Transportation, State Highway Administration, Standards for Highway and Incidental Structures shall be used for traffic barriers, barricades, and end treatments.
(4) 
Material shall be per Section 612 of the Maryland Department of Transportation, State Highway Administration, Standard Specification for Construction and Materials.
H. 
Curb and gutter.
(1) 
Curb and gutter shall be required in all urban residential subdivisions and Town Centers where sidewalks are required along public roads.
(2) 
At the discretion of the Director, curb and/or gutter shall be required in residential subdivisions and commercial development where conditions warrant, i.e., soil conditions, topography, or volume of runoff.
I. 
Shoulders. When applicable, shoulders shall be earthen or paved per the detailed standard plates contained herein.
J. 
Valley gutters. Valley gutters shall be used only when approved by the Director but normally shall be permitted where the approach road is a residential local road, providing that the rate of water flow across the intersection does not exceed two cubic feet per second.
K. 
Bicycle pathways.
(1) 
Hiker/bicycle pathways shall be constructed when required as part of the development review and approval process by the Planning Commission. Construction standards shall be designed by the engineering professional representative, and approved by the Director.
(2) 
Bicycle pathways may be located within the roadway pavement, separate from the traveled way but within the right-of-way, or within their own right-of-way such as through open areas.
(3) 
Signing and marking shall be required in accordance with the MUTCD.
L. 
Lighting. Maintenance agreements between the County and property owners are required for all lighting proposed within a public right-of-way.
M. 
Street trees - interior to subdivisions.
(1) 
Street trees shall be provided for new development projects in accordance with the Calvert County Zoning Ordinance applicable to commercial and residential development within Calvert County.
(2) 
Street trees shall be planted outside the road right-of-way. Species are to be selected from the current Zoning Ordinance and the current Rural Design Manual for the applicable condition. In general, species should be varied for texture, color and form and selected to be compatible with the scale of the roadway, intersections, adjacent improvements, and any underground or overhead utilities.
(3) 
Planted trees shall be installed using the general spacing guidelines in Table 3-1 to maintain safety and prevent interference with utility structures and appurtenances. Street trees shall not obstruct or obscure any traffic control device, streetlighting, signage or sight distance.
Table 3-1
General Spacing Guidelines
30 feet
Intersection
25 feet
Traffic or directional sign
25 feet
Light or utility pole
10 feet
Entrance drive or alley
15 feet
Drain or drain inlet structure
15 feet
Open space or stormwater management access easement
15 feet
Underground utility
(4) 
The species, ultimate size of the tree and the canopy desired should be compatible with the size of the right-of-way and the road classification. Trees shall be selected to survive the environmental stresses of the proposed location.
(5) 
Planting plans shall be reviewed by Planning and Zoning. Please refer to the Rural Design Manual.
N. 
Landscaping. Regulations governing the installation of landscaping are contained in the current Zoning Ordinance and the current Rural Design Manual. However, no landscaping shall be planted in the shoulder areas or within five feet of a ditch.

§ 104-30 Roads serving 10 or fewer newly created lots in the Rural Community District.

A. 
Right-of-way widths for proposed roads shall be a minimum of 30 feet.
B. 
The road shall be constructed per Plate RD-3A of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures."
C. 
The road shall be constructed in accordance with an approved plan under a public works agreement.
D. 
The issuance of building permits and use and occupancy permits will depend upon Bonding Method A or B.

§ 104-31 Family conveyance lots served by private roads.

A. 
All family conveyance lots shall provide access to either state, County or privately owned roads. If access is on a state road, a permit is required from the MSHA.
B. 
A private access easement or right-of-way in width of 20 feet, a minimum surface width of 12 feet with shoulders of four feet in width, and a minimum depth of four inches' compacted CR-6 or approved equal shall be provided when serving one to five building lots per Plate RD-1A of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures."
C. 
A private access easement or right-of-way with a minimum width of 24 feet, a surface width of 16 feet with a shoulder width of four feet, and a four-inch depth of compacted CR-6 or approved equal shall be provided when serving six to 10 building lots per Plate RD-1A of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures."
D. 
Rights-of-way created within the property parcel being subdivided shall meet the current standards of the Calvert County Zoning Ordinance.
E. 
Unless a traffic hazard exists or the additional lot(s) shall create such, or unless the topography is such as to require storm drainage structures or easements or other surface requirements, no additional road improvements shall be required as part of the current ordinance.
F. 
The proposed road access shall be private, non-County-owned or -maintained. The developer shall be responsible for providing for road construction. Road maintenance, including snow removal, repairs, and other improvements, as well as road services normally provided by the County, shall be the responsibility of all lot owners accessing the family conveyance road. A recorded access and maintenance agreement shall be required as part of the grading permit application submittal for the roadway.
G. 
At the applicant's expense, the private road shall be posted with a road name sign marked with a blue background with white letters to illustrate a non-County-maintained road.
H. 
If the private road exists, it shall be improved in accordance with an approved plan under a grading permit. Building permits will be issued for lots being served by the road once a public works agreement has been executed; however, use and occupancy permits will be held until the base road is constructed, inspected, and approval is granted by the Director.
I. 
If the private road is to be newly constructed, it shall be constructed in accordance with an approved plan under a public works agreement. Building permits will be issued for lots being served by the road once a public works agreement has been executed; however, use and occupancy permits will be held until the base road is constructed, inspected, and approval is granted by the Director.
J. 
If there is a desire to make this right-of-way or easement a County road, it shall be upgraded to County road standards as set forth in the current ordinance and current Subdivision Regulations in effect at the time of said upgrading.
K. 
Family conveyance roadways in excess of 500 linear feet shall a thirty-five-foot long turnout. Additional turnouts may be required based on the length of roadway. See Turnout Detail on Plate 1A of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures."

§ 104-32 Private roads in the Farm and Forest District.

A. 
Access to the development shall be provided to a state or County road. If access is on a state road, a permit is required from the MSHA.
B. 
Private roads in the Farm and Forest District shall meet the standards on Plate RD-1A of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures."
C. 
The private road shall serve a maximum of five lots.
D. 
The proposed road access shall be private, non-County-owned or -maintained, and shall not be petitionable to the County for maintenance. A notation of such restriction shall be placed on the plat and signed by the property owners and shall remain in effect in perpetuity. The developer shall be responsible for providing for road construction. Road maintenance, including snow removal, repairs, and other improvements, as well as road services normally provided by the County, shall be the responsibility of all lot owners accessing the private road. A recorded shared maintenance agreement shall be required as part of the public works agreement submittal.
E. 
At the applicant's expense, the private road shall be posted with a road name sign marked with a blue background with white letters to illustrate a non-County-maintained road.
F. 
The private road shall be constructed in accordance with an approved plan under a public works agreement.
G. 
Building permits will be issued for lots being served by the road once a public works agreement has been executed; however, use and occupancy permits will be held until the base road is constructed, inspected, and approval is granted by the Director.
H. 
No lot or parcel in a subdivision, subject to these regulations, shall be transferred until a plat recording has been completed per the Subdivision Regulations, a public works agreement for the road improvements has been executed, and the base road approval of the platted roads has been completed by the developer and approved by Project Management and Inspections.

§ 104-33 Common access driveways.

A. 
Common access driveways shall provide connection, like a family conveyance, to a state or County road. If access is on a state road, a permit is required from the MSHA. Common access driveways are not required where accessing an interior subdivision street, as classified by the Department.
B. 
Construction standards are located on Plate RD-16 of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures."
C. 
The proposed private access shall serve a maximum of five lots.
D. 
The proposed road access shall be private, non-County-owned or -maintained, and shall not be petitionable in perpetuity to the County for maintenance. A notation of such restriction shall be placed on the plat and signed by the property owners. The developer shall be responsible for providing for road construction. Road maintenance, including snow removal, repairs, and other improvements, as well as road services normally provided by the County, shall be the responsibility of all lot owners accessing the common access driveway. A recorded shared maintenance agreement shall be required as part of the public works agreement submittal.
E. 
At the applicant's expense, the private road shall be posted with a road name sign marked with a blue background with white letters to illustrate a non-County-maintained road.
F. 
Common access driveways shall be constructed in accordance with an approved plan under a public works agreement.
G. 
Building permits will be issued for lots being served by the road once a public works agreement has been executed; however, use and occupancy permits will be held until the base road is constructed, inspected, and approval is granted by the Director.
H. 
No lot or parcel in a subdivision subject to these regulations shall be transferred until a plat recording has been completed per the Subdivision Regulations, a public works agreement for the road improvements has been executed, and the base course of the platted roads has been completed by the developer and approved by Project Management and Inspections.

§ 104-34 Private roads for industrial subdivisions.

A. 
Private road access to the development shall be provided to a state or County road. If access is on a state road, a permit is required from the MSHA.
B. 
Construction standards are located on Plate RD-8B of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures."
C. 
The proposed privately owned road shall serve a maximum of five lots.
D. 
The proposed road access shall be private, non-County-owned and -maintained, and shall not be petitionable in perpetuity to the County for County maintenance. A notation of such restriction shall be placed on the plat and signed by the property owners. The developer shall be responsible for providing for road construction. Road maintenance, including snow removal, repairs, and other improvements, as well as road services normally provided by the County, shall be the responsibility of all lot owners accessing the private road. A recorded shared maintenance agreement shall be required as part of the public works agreement submittal.
E. 
At the applicant's expense, the private road shall be posted with a road name sign marked with a blue background with white letters to illustrate a non-County-maintained road.
F. 
The private road shall be constructed in accordance with an approved plan under a public works agreement.
G. 
Building permits will be issued for lots being served by the road once a public works agreement has been executed; however, use and occupancy permits will be held until the base road is constructed, inspected, and approval is granted by the Director.
H. 
No lot or parcel in a subdivision subject to these regulations shall be transferred until a plat recording has been completed per the Subdivision Regulations, a public works agreement for the road improvements has been executed, and the base course of the platted roads has been completed by the developer and approved by the Director.

§ 104-35 Private lanes.

A. 
Private lane access shall be provided to meet the standards of this chapter.
B. 
The travel way shall be stabilized a minimum 16 feet wide with CR6 or bank-run gravel, or an approved alternate material. Private lanes shall meet the standards on Plate RD-1B of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures."
C. 
Maximum grade for private lanes shall be 15%.
D. 
The proposed private lane shall serve a minimum of three lots and a maximum of five lots.
E. 
The proposed private lane shall have a thirty-foot minimum right-of-way.
F. 
The proposed private lane shall be a maximum length of 400 feet.
G. 
Private lane access connection to an existing County or state road shall be in conjunction with a common access drive per Plate RD-16 of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures." If access is on a state road, a permit is required from the MSHA.
H. 
The proposed lane shall be private, non-County-owned and -maintained, and shall not be petitionable in perpetuity to the County for County ownership or for County maintenance. A notation of such restriction shall be placed on the plat and signed by the property owners. The developer shall be responsible for providing for road construction; and the lot owners shall be responsible for maintenance, including snow removal and repairs, as well as other improvements and road service normally provided by the County. A recorded shared maintenance agreement shall be required as part of the public works agreement submittal.
I. 
At the applicant's expense, the private road shall be posted with a road name sign marked with a blue background with white letters to illustrate a non-County-maintained road.
J. 
The private lane shall be constructed in accordance with an approved plan under a public works agreement.
K. 
Building permits will be issued for lots being served by the road once a public works agreement has been executed; however, use and occupancy permits will be held until the base road is constructed, inspected, and approval is granted by the Director.
L. 
No lot or parcel in a subdivision subject to these regulations shall be transferred until a plat recording has been completed per the Subdivision Regulations, a public works agreement for the road improvements has been executed, and the base road approval of the platted roads has been completed by the developer and approved by Project Management and Inspections.

§ 104-36 Existing serviceable roads and recorded lots.

A. 
"Serviceable roads" are defined as roads accessing existing homes and having a good history of maintenance as verified by the County representative.
B. 
Access to the development shall be provided to a state or County road. If access is on a state road, a permit is required from the MSHA.
C. 
An existing roadway with a minimum width of 12 feet and four inches of compacted CR-6 or approved equal is required for issuance of a building permit.
D. 
A grading permit may be required for improvements to the road.
E. 
At the applicant's expense, the private road shall be posted with a road name sign marked with a blue background with white letters to illustrate a non-County-maintained road.

§ 104-37 Agribusiness roads.

For commercial (retail sales) and/or agribusiness developments on unsubdivided property requiring site plan approval, the applicant shall demonstrate adequate access to the site and that this access is specifically adapted to the uses anticipated and takes into account existing and proposed uses in the vicinity. The minimum adequate access shall be a twenty-foot-wide roadway surfaced with a minimum of six inches of graded aggregate base gravel (GAB).

§ 104-38 Existing subdivisions recorded prior to the adoption of the Calvert County Zoning Ordinance (July 29, 1967).

A. 
Private road construction or reconstruction in subdivisions created prior to the adoption of the ordinance on October 12, 1976, and platted before the adoption of the Calvert County Zoning Ordinance shall be in accordance with Plate RD-1A of "The Calvert County Construction Standards for Roads, Streets, and Incidental Structures."
B. 
Subdivisions meeting these criteria shall enter into road construction agreements with the Board which result in a variance set forth in the ordinance as noted above, provided that all of the following conditions have been met:
(1) 
Said subdivision shall have been platted before the adoption of the initial Calvert County Zoning Ordinance.
(2) 
Said subdivision contains interior private roads not contiguous to public County roads.
(3) 
There exists a homeowners' association in said subdivision with membership by a majority of the homeowners within the subdivision.
(4) 
There is an exclusive escrow mechanism set up for the collection of fees for the maintenance and upkeep of infrastructure, including but not limited to stormwater management facilities and other amenities. The funds in this escrow account shall only be used for the purpose stated herein.
(5) 
Said subdivision has an established road maintenance program as well as a history of reasonable road maintenance.
C. 
Upon meeting the above conditions, the road construction agreement to be entered into shall serve as guidelines and shall be binding on both the County and the homeowners' association. The agreement shall provide:
(1) 
The homeowners' association shall be issued a grading permit for road construction after submitting and receiving approval of a written specification plan describing the work to be accomplished, or a road construction plan, both of which should outline the sediment control practices to be applied and the road typical sections.
(2) 
Under this grading permit, the homeowners' association shall be allowed to construct the platted roadways specified in the description of work. In addition, the homeowners' association shall be responsible for the maintenance of any of the platted roadways constructed by others.
(3) 
The County shall provide inspection services under the grading permit.
(4) 
Prior to issuance of use and occupancy permits, the roadway shall be constructed per Plate RD-1A and inspected in accordance with the ordinance, with the exception of surface paving.
(5) 
The homeowners' association shall agree that Calvert County shall not be required to accept the roads into the County maintenance system until such time as the roads meet County specifications or are put into a road tax district.
(6) 
The homeowners' association shall agree to provide all maintenance, including snow removal, to the constructed roads within the subdivision.

§ 104-39 Road tax districts.

Unless otherwise prohibited by a recorded land instrument, residents of existing, privately owned rights-of-way are eligible to petition the Board to become a publicly owned and maintained roadway through the Road Tax District Program. The Road Tax District Program and the process for petitioning is described in the Annotated Code of Maryland, Article 25, § 155A.[1] If the petition is approved, the roadway must be constructed to the following minimum standards:
A. 
The minimum right-of-way width that must be provided is 30 feet.
B. 
The minimum constructed roadway width is 20 feet.
C. 
A vehicle turnaround must be provided at the terminus of the roadway as well as any additional right-of-way this requires.
[1]:
Editor's Note: Article 25 of the Annotated Code of Maryland was repealed by Acts 2013, c. 119, effective 10-1-2013.

§ 104-40 Abandonment of rights-of-way.

All proposed plats that include abandonment of public or privately owned rights-of-way shall be reviewed by the Department and shall request a public hearing before the Board for the abandonment of said public or private rights-of-way, unless otherwise approved by the Director. All proposed abandonments shall be accompanied by a metes and bounds description of the portion of the right-of-way to be abandoned, as well as a plat exhibit to include bearings and distances. Requirements for the public hearing request are detailed in the Annotated Code of Maryland.