|
User's Guide: This article contains specific road design
and construction standards applicable to all developments requiring
approval under this chapter, particularly subdivisions.
|
A.
The proposed development shall provide for safe access to and from
public and private roads.
(1)
Safe access shall be assured by providing an adequate number and
location of access points with respect to sight distances, intersections,
schools and other traffic generators.
(2)
Curb cuts shall be limited to the minimum number and widths necessary
for safe entering and exiting.
(3)
The proposed development shall not have an unreasonable adverse impact
on the Town road system.
B.
The proposed development shall assure safe interior circulation within
its site by separating pedestrian and vehicular traffic and providing
adequate parking and loading areas.
C.
Provisions shall be made for providing and maintaining convenient
and safe emergency vehicle access to all buildings and structures
at all times.
D.
The Board shall not approve any development plan unless proposed
roads are designed in accordance with the specifications contained
in this chapter. Approval of a final plan by the Board shall not be
deemed to constitute or be evidence of acceptance by the Town of any
road or easement.
E.
Applicants shall submit to the Board, as part of their final plan,
detailed construction drawings showing a plan view, profile, and typical
cross-section of the proposed roads and parking areas. The plans shall
include the following information:
(1)
Date, scale, and magnetic or true North point.
(2)
Intersections of the proposed road with existing roads.
(3)
Road right-of-way limits including edge of pavement, edge of shoulder,
sidewalks, and curbs.
(4)
Complete curve data for all horizontal and vertical curves.
(5)
Turning radii at all intersections.
(6)
Center-line gradients.
(7)
Locations of all existing and proposed overhead and underground utilities.
F.
Upon receipt of plans for a proposed public road the Board shall
forward one copy to the Board of Selectmen, the Town Manager, Road
Commissioner, and the Town's consulting engineer for review and
comment. Plans for roads which are not proposed to be accepted by
the Town shall be sent to the Town's consulting engineer for
review and comment.
A.
These design standards shall be met by all roads within developments
reviewed under this chapter and shall control the roadway, shoulders,
curbs, sidewalks, drainage systems, culverts, and other appurtenances.
B.
Roads shall be designed to discourage through traffic within residential
developments.
C.
Wherever existing or other proposed roads, topography, and the public
safety permit, roads should run in east/west directions to maximize
access for solar energy utilization. The character, extent, width,
and grade of all roads shall be considered in their relation to existing
or planned roads.
D.
Where a development borders an existing narrow road, not meeting
the width requirements of the standards for roads in this chapter,
or when the Comprehensive Plan indicates plans for realignment or
widening of a road would require use of some of the land in the development,
the development plan shall indicate reserved areas for widening or
realigning the road marked "Reserved for Road Realignment (Widening)
Purposes."
(1)
Land reserved for such purposes may not be included in computing
lot area or setback requirements of this chapter.
(2)
When such widening or realignment is indicated on the development
plan, the reserve area shall not be included in any lot but shall
be reserved to be deeded to the Town or state.
E.
Where a major subdivision or development abuts or contains an existing
or proposed Town way, no residential lot may have vehicular access
directly onto the Town way.
(1)
This requirement shall be noted on the plan and in the deeds of any
lot with frontage on the Town way.
(2)
This requirement may be waived by the Board for up to four lots,
upon a showing by the developer that the Town way on which the proposed
lots abut is not a traffic artery or high-volume traffic road and
that such access will not cause a safety problem. Traffic arteries
and high traffic roads in the Town of Islesboro are designated as
follows:
[Amended 6-6-2012]
|
Name of Street
|
Location
| |
|---|---|---|
|
Babbidge Road
|
From Pendleton Point Road to West Shore Drive
| |
|
Derby Road
|
From Pendleton Point Road to West Shore Drive
| |
|
East Shore Drive
|
From Pendleton Point Road to the northernmost point of Charlotte's
Cove
| |
|
Ferry Road
|
From Grindle Point to intersection of West Bay Road and Mill
Creek Road
| |
|
Hewes Point Road
|
From Main Road to its easternmost point
| |
|
Main Road
|
From Pendleton Point Road to Turtle Head Road
| |
|
Meadow Pond Road
|
From Main Road to Turtle Head Road
| |
|
Mill Creek Road
|
From Ferry Road to intersection of Main Road and Pendleton Point
Road
| |
|
Pendleton Point Road
|
From Pendleton Point to intersection of Mill Creek Road and
Main Road/Pendleton Point Road
| |
|
Turtle Head Road
|
From Main Road to Meadow Pond Road
| |
|
West Bay Road
|
From Ferry Road to Main Road (Historical Society)
| |
|
West Shore Drive
|
From Derby Road to Pendleton Point Road
|
F.
Any development containing 20 or more lots or dwelling units shall
have at least two road connections with existing public roads, roads
shown on the Protection Districts Map, or roads on an approved development
plan for which performance guarantees have been filed and accepted.
G.
The following design standards in Table 1 apply according to road
classification:
|
Table 1
| |||
|---|---|---|---|
|
Description
|
Public Rights-of-Way
|
Private Rights-of-Way
| |
|
Minimum right-of-way width (feet)
|
50
|
50
| |
|
Minimum pavement width (feet)
|
18 to 20
|
18 to 20
| |
|
Minimum shoulder width (each side) (feet)
|
2 to 4
|
2 to 4
| |
|
Minimum grade
|
0.5%
|
N/A
| |
|
Maximum grade
|
6%
|
10%
| |
|
Minimum center-line radius (feet)
|
150
|
150
| |
|
Minimum tangent between curves of reverse alignment (feet)
|
100
|
100
| |
|
Roadway crown
|
0.25 inch per foot
|
N/A
| |
|
Minimum angle of road intersections
|
90°
|
90°
| |
|
Maximum grade within 75 feet of intersection
|
2%
|
N/A
| |
|
Minimum curb radii at intersections (feet)
|
15
|
N/A
| |
|
Minimum right-of-way radii at intersections (feet)
|
10
|
10
| |
H.
The center line of the roadway shall be the center line of the travel
portion of the right-of-way.
[Amended 6-6-2012]
I.
In addition to the design standards above, dead-end roads shall be
constructed to provide a cul-de-sac turnaround with the following
requirements for radii:
(1)
Sixty-five-foot property line radii and fifty-foot outer edge of
travel way radii.
(2)
The Board may require the reservation of a twenty-foot easement in
line with the dead end road to provide continuation of pedestrian
traffic or utilities to the next road.
(3)
The Board may also require the reservation of a fifty-foot easement
in line with the dead-end road to provide continuation of the road
where future subdivision or development is possible.
J.
The following are the requirements for grades, intersections and
sight distances:
(1)
Grades of all roads shall conform in general to the terrain, so that
cut and fill are minimized while maintaining the grade standards above.
(2)
All changes in grade shall be connected by vertical curves to provide
for the minimum sight distances below.
(3)
Where new road intersections or driveway curb cuts are proposed,
sight distances, as measured along the road onto which traffic will
be turning, shall be based upon the posted speed limit and conform
to Table 2 below:
|
Table 2
| ||||||||
|---|---|---|---|---|---|---|---|---|
|
Posted Speed Limit (miles per hour)
|
15
|
20
|
25
|
30
|
35
|
40
|
45
| |
|
Sight Distance (feet)
|
150
|
200
|
250
|
300
|
350
|
400
|
450
| |
(4)
Where necessary, corner lots shall be cleared of all growth and sight
obstructions, including ground excavation, to achieve the required
visibility.
K.
Cross (four-cornered) road intersections shall be avoided insofar
as possible, except as shown on the Comprehensive Plan or at other
important traffic intersections. A minimum distance of 200 feet shall
be maintained between center lines of side roads.
L.
Where installed, curbing shall be granite or bituminous concrete
and shall be installed on a thoroughly compacted gravel base of six
inches minimum thickness, except bituminous curbing shall be installed
on the base course of the pavement. The specified pavement width above
shall be measured between the curbs.
A.
Minimum thickness of material after compaction shall conform to Table
3 below:
|
Table 3
Minimum Requirements
| ||||
|---|---|---|---|---|
|
Road Materials
|
Public Rights-of-Way
(inches)
|
Private Rights-of-Way
(inches)
| ||
|
Aggregate subbase course
Maximum sized stone = 411
|
18
|
12
| ||
|
Crushed aggregate base course
|
3
|
3
| ||
|
Hot bituminous pavement
| ||||
|
Total thickness
|
2.50
|
N/A
| ||
|
Surface course
|
0.75
|
N/A
| ||
|
Base course
|
1.75
|
N/A
| ||
B.
The following procedures shall be followed in preparing new road
sites:
(1)
Before any clearing has started on the right-of-way, the center line
and sidelines of the new road shall be staked or flagged at fifty-foot
intervals.
(2)
Before grading is started, the entire area under the proposed travel
way(s), shoulders, side slopes and drainageways shall be cleared of
all stumps, roots, brush, and other objectionable material. All ledge,
large boulders, and tree stumps shall be removed from this area. The
Planning Board may require additional removal of stumps, roots, brush,
ledge, large boulders and other objectionable material within the
right-of-way.
(3)
All organic materials shall be removed to a depth of two feet below
the subgrade of the roadway. Rocks and boulders shall also be removed
to a depth of two feet below the subgrade of the roadway. On soils
which have been identified by the Town's consulting engineer
as not suitable for roadways, the subsoil shall be removed from the
road site to a depth of two feet below the subgrade and replaced with
material meeting the specifications for gravel aggregate subbase in
Table 4 below.
(4)
Side slopes shall be no steeper than a slope of three feet horizontal
to one foot vertical and shall be graded, limed, fertilized, and seeded
according to the specifications of the erosion and sedimentation control
plan.
(5)
All underground utilities shall be installed prior to paving or placement
of the final gravel course. Building sewers and water service connections
shall be installed to the edge of the right-of-way prior to paving
or placement of the final gravel course.
C.
Road subbase and base construction requirements are as set forth
below:
(1)
Road bases shall be constructed as follows: The aggregate subbase
course shall be sand and gravel of hard durable particles free from
vegetative matter, lumps or balls of clay and other deleterious substances.
The gradation of the part that passes a three-inch square mesh sieve
shall meet the following grading requirements:
|
Table 4
| ||
|---|---|---|
|
Sieve Designation
|
Percentage by Weight Passing Square Mesh Sieve
| |
|
1/4 inch
|
25% to 70%
| |
|
No. 40
|
0% to 30%
| |
|
No. 200
|
0% to 7%
| |
(2)
Aggregate for the subbase shall contain no particles of rock which
will not pass the six-inch square mesh sieve. The aggregate base course
shall be screened or crushed gravel of hard durable particles free
of vegetative matter, lumps, or balls of clay and other deleterious
substances. The gradation of the material that passes a two-inch square
mesh sieve shall meet the following grading requirements:
|
Table 5
| ||
|---|---|---|
|
Sieve Designation
|
Percentage by Weight Passing Square Mesh Sieve
| |
|
1/2 inch
|
45% to 70%
| |
|
1/4 inch
|
30% to 55%
| |
|
No. 40
|
0% to 20%
| |
|
No. 200
|
0% to 5%
| |
(3)
Aggregate for the base shall contain no particles of rock which will
not pass the two-inch square mesh sieve.
D.
Where new pavement joins an existing pavement, the existing pavement
shall be cut along a smooth line and form a neat, even vertical joint.
E.
Road curbs and gutters shall be installed as required by the Board.
Curbs shall be vertical except when sloped curbs are specifically
allowed or required by the Board.
F.
Minimum standards for the base layer of pavement shall be the Maine
Department of Transportation (MDOT) specifications for plant mix Grade
B with an aggregate size no more than 3/4 inch maximum.
G.
Minimum standards for the surface layer of pavement shall meet the
MDOT specifications for plant mix Grade C with an aggregate size no
more than 1/2 inch maximum.
H.
The finish course of gravel roads shall consist of not less than
four inches of gravel or crushed rock with an aggregate size no more
than 1/2 inch maximum with sufficient crown to provide adequate drainage.
I.
Notwithstanding the above requirements, the Board may approve substitution
of shale or other material for the subbase course and base course,
provided that, in the opinion of the Town's consulting engineer,
the shale or other material will not interfere with or degrade the
base layer or surface layer of paved roads or the finish layer of
gravel roads.
Following road construction, the developer or contractor shall
conduct a thorough cleanup of stumps and other debris from the entire
road right-of-way. If on-site disposal of the stumps and debris is
proposed, the site shall be indicated on the plan, and be suitably
covered with fill and topsoil, limed, fertilized and seeded.
A.
Roads which join and are in alignment with roads of abutting or neighboring
properties shall bear the same name.
B.
Names of new roads shall not duplicate nor bear phonetic resemblance
to the names of existing roads within the Town and shall be subject
to the approval of the Board.
C.
The developer shall install road name signs, traffic safety and control
signs or, at the option of the Board, when installed by the Town,
reimburse the Town for the costs of such installation.
D.
Road lighting shall be installed as approved by the Board.
A.
Upon completion of road construction, a written certification signed
by a professional engineer registered in the State of Maine shall
be submitted to the Codes Enforcement Officer, at the expense of the
applicant, certifying that the proposed way meets or exceeds the design
and construction requirements of this chapter.
B.
As-built plans shall be submitted to the Codes Enforcement officer.
