[Added 10-10-2002 by Bill No. 8-02, effective 11-24-2002]
The Index of Arterial Highways shall be as follows:
Functional Class
Route Name or Number
Location in Allegany County
Principal arterial
168 (National Freeway)
Garrett County line to Washington County line
Route 220 North
Pennsylvania State line to I-68
Major arterial
Route 36
Alternate Route 40 in LaVale to Route 135 at Westernport
Alternate Route 40
Garrett County line to Willow Brook Road
Route 47
Route 36 at Barrellville to Pennsylvania State line
Route 35
Route 36 at Corriganville to Pennsylvania State line
Route 135
Garrett County line to Route 220 in McCoole
Route 956
Route 220 at Pinto to West Virginia State line
Route 51
I-68 in Cumberland to West Virginia State line
Route 220 South
I-68 to West Virginia State line
Minor arterial
Route 936
Route 36 at Midland to Alternate Route 40 in Frostburg
Route 55
Route 36 at Vale Summit to Alternate Route 40 in Clarysville
Midlothian Road
I-68 to Alternate Route 40 in Frostburg
Route 53 (Winchester Road)
Alternate Route 40 in LaVale Road to Route 220 in Cresaptown
Route 658 (Vocke Road; Campground Road)
Alternate Route 40 in LaVale to Route 53 in LaVale
Route 636 (Warrior Drive)
Route 53 to Route 220 in Cresaptown
Route 144
I-68 at Naves Crossroads to I-68 at 15 Mile Creek
Scenic Route 40
I-68 at 15 Mile Creek to Washington County line
Route 639 (Willowbrook Road) Williams-Messick Roads
I-68 at Cumberland to Route 51
Town Creek — Bear Hill Roads
Route 144 at Flintstone to Route 51 at Oldtown
Old Route 220
Route 220 North at Smouses Mill Road to Route 144 at Naves Crossroad
A. 
Plans. Plans for all roadways showing full plan and profile information drawn to a scale no smaller than one inch equals 50 feet horizontal and one inch equals 10 feet vertical shall be submitted for review and approval of the County Roads Division. The plan shall show horizontal and vertical curve data, roadway cross section and detail of drainage facilities (including appropriate calculations).
B. 
Right-of-way. Rights-of-way shall be as follows:
Type of Road
Feet
Major collectors and arterials
60 minimum
All other roads and streets
50
C. 
Utilities. Utilities shall be set back outside of pavement and within 20 feet of outside edge of right-of-way.
D. 
Drainage. The minimum shall be twelve-inch pipe for driveway entrance and 15 inches for road crosspipes. Where a larger size pipe is necessary, the size is to be approved by the County Engineer and other affected agencies. All pipes shall be fitted with standard end sections or riprap inlet and outlet protection (with geotextile fabric).
E. 
Gradient. The maximum allowed on new roads shall be 12% for sections of road up to 500 feet in length and less than fifteen-degree curve; otherwise, maximum allowed gradient is 10%.
F. 
Curve. Curves shall comply with AASHTO standards for local roads and streets for 30 miles per hour design speed and 0.08 maximum superelevation rate.
G. 
Access. Driveway access is not to exceed 5% for a distance of 30 feet beyond the road shoulder.
H. 
Roadway widths (two lanes-County roads). Roadway widths shall be as follows:
[Added 10-10-2002 by Bill No. 8-02, effective 11-24-2002]
Specifications
Paved Roadway
County Highway Function Classification
With Curbing
(feet)
Without Curbing
(feet)
Shoulder Width1
(feet)
Subbase Width
(feet)
Minor arterial
34
24
10
a
Collector or industrial park road
34
24
10
a
All other streets and roads with ADT greater than 400
26
20
6
a
All other streets and roads with ADT less than or equal to 400
18-222
18-222
b
b
NOTES:
ADT — Design Average Daily Traffic count as approved by the County Engineer.
1
For roadways without curbing.
2
Roadway width depends upon design speed and functional use per AASHTO Standards.
(a)
Paved width plus shoulder width plus six inches each side.
(b)
Roadside clear zone determined per AASHTO Standards.
I. 
Road surface specifications. Specifications shall be as follows:
Type
Arterial and Major Collectors
All Others
Subbase*
Compacted earth
Compacted earth
Base course*
10 inches GASB stone
8 inches GASB stone
Surface paving
4 inches bituminous in concrete two layers
3 inches bituminous concrete in two layers
Curbing (no bituminous curbing allowed)
Poured in place concrete curb and gutter
Poured in place concrete curb and gutter or precast concrete curb (if applicable)
NOTES:
* Subbase and base material shall be compacted to 95% of optimum density as determined by AASHTO Method T-180.
J. 
Triple surface treatment specifications.
(1) 
Triple surface treatment may only be utilized when surface treatment portions of an existing County-maintained road are being upgraded or extended for a major subdivision. All new roads taken into the County-maintained system must have a bituminous concrete surface.
(2) 
All quantities shall be in place per square yard, with materials and construction methods to meet Maryland SHA specifications, as follows:
Layer
RS3K Emulsified Asphalt
(gallons per square yard)
Graded Stone
1st
0.50
No. 54; 40 pounds per square yard
2nd
0.30
No. 7; 25 pounds per square yard
3rd
0.30
No. 8; 20 pounds per square yard
K. 
Road construction appurtenances. The developer shall provide the following road construction appurtenances where the same are deemed necessary by the County Roads Division. (All materials and construction methods shall meet Maryland SHA Specifications.)
(1) 
Standard traffic barriers (guardrail).
(2) 
Engineering stabilization fabric.
(3) 
Traffic control devices (including signs and line striping).
(4) 
Riprap for drainage ditch stabilization.
(5) 
Street name signs.
L. 
Turnaround right-of-way diameter. Turnaround right-of-way diameter shall be as follows:
(1) 
Type of Industrial Park Access Road: 150 feet.
(2) 
Major collector: 100 feet.
(3) 
Other: 80 feet.
M. 
Minimum overhead clearance. Minimum overhead clearance shall be 18 feet for utilities, bridges or other obstructions.
N. 
Residential driveway setback. Residential driveway setback shall be 200 feet from intersection of arterials or major collectors.
[Amended 10-10-2002 by Bill No. 8-02; effective 11-24-2002]
O. 
Driveway junctions. Driveway junctions shall match the grade of the street for a distance equal to shoulder width, then no more than 5% for a distance of 30 feet beyond the shoulder. Junctions should be at a ninety-degree angle to highway or street.
P. 
Additional standards:
(1) 
All construction shall be inspected and approved by the County Engineer or authorized representative, while construction is in process. Final approval of construction must be made by the County Engineer prior to actual acceptance of roads or streets for maintenance by the County.
(2) 
Site specific conditions may result in modification of these requirements, subject to the County Engineer's approval.
(3) 
Industrial park access roads shall meet major collector standards.
(4) 
Any bridges or large-size culvert pipes shall be subject to special site specific design criteria which will be established by the County Engineer.
See Allegany County Standard Specifications and Details for Water and Sewer Construction, latest edition, as administered by the Public Works Department, Utilities Division, or other public or private utility provider, as appropriate.[1]
[1]
Editor's Note: Rights-of-way and easements are shown in §§ 390-19D(7) and (8) and in 360-23B.
Recreation land standards shall be as follows:
Lot Size or Area per Unit
Percentage of Total Subdivision Area to be Dedicated for Recreation
Above 10,000
None required
8,000 to 10,000
2.5%
6,000 to 8,000
5.0%
4,000 to 6,000
7.5%
4,000 or less
10.0%