The following criteria shall be the basis for
the design of all streets.
A.Â
Street widths.
[Amended 6-21-1991 by L.L. No. 16-1991; 12-3-1999 by L.L. No. 33-1999]
(1)Â
General.
(a)Â
Street widths shall conform to the standard dimensions set forth in Subsection A(1)(b) below, except that the Planning Board shall have the power to approve lane specifications as set forth in Subsection A(1)(b) in a residential subdivision in which a street serves five to 23 lots. Such power shall include approving the narrowing of a standard street to the width of a lane for that portion of said street serving 23 lots or less.
(b)Â
Street widths shall be as follows:
|
Type of Street
|
Right-of-Way Width
(feet)
|
Cleared Width
(feet)
|
Improved Roadway Width
(feet)
| |
|---|---|---|---|---|
|
Standard
|
50 (minimum)
|
32
|
24
| |
|
Lane
|
50 (minimum)
|
28
|
20
|
(2)Â
All streets which terminate at a natural body
of water shall have a minimum width of 100 feet for a distance of
not less than 100 feet from the mean high-water line and/or such other
facilities for parking and traffic as the Board may require with adequate
drainage facilities on site to prevent runoff into surface water.
(3)Â
Grading of shoulder areas. Shoulder areas for
standard and lane streets shall be graded such that slopes do not
exceed a 1:3 slope for a minimum distance of 10 feet from the edge
of pavement except where exceptional and unavoidable circumstances
exist.
[Added 12-3-1999 by L.L. No. 33-1999]
B.Â
Horizontal alignment.
(1)Â
The minimum center-line radius of any street
curvature shall be 125 feet for lanes and 200 feet for standard streets.
[Amended 12-3-1999 by L.L. No. 33-1999]
(2)Â
The minimum tangent distance between reverse
curves shall be 50 feet.
(3)Â
Property line radii at street corners shall
not be less than 25 feet.
C.Â
Vertical alignment.
(1)Â
Gradients of all streets shall conform as much
as possible to the natural terrain but shall not be more than 10%
nor less than 0.5%.
(2)Â
All changes in grade of more than 1.00% shall
be connected with a vertical curve.
(3)Â
The length (L) in feet of a vertical curve shall
be related to the algebraic difference in the percent of grade (A)
and constant (K equals 35 for lanes, and K equals 50 for standard
streets) according to the following formula:
|
L = KA
| |
|---|---|
|
This formula shall be used for both sag and
crest vertical curves.
[Amended 12-3-1999 by L.L. No. 33-1999] |
(4)Â
Road gradients approaching intersections shall
not exceed 2.50%.
(5)Â
The minimum tangent distance between vertical
curves shall be 50 feet.
(6)Â
All vertical profiles shall meet the minimum
elevation requirements specified under this chapter.
(7)Â
Paved gutters will be required in accordance with § 220-3.03B(4) and (5).
D.Â
Intersections.
(1)Â
Four-cornered intersections shall be avoided
wherever possible, and the angle of intersection of all streets shall
be as near to 90° as possible.
(2)Â
The intersections of lanes leading into a standard
street from opposite sides of the standard street shall be separated
by a minimum of 125 feet between center lines.
[Amended 12-3-1999 by L.L. No. 33-1999]
(3)Â
The minimum acceptable intersection sight distance
shall be provided by a cleared area, formed by an isosceles right
triangle having thirty-foot sides measured along the edge of pavements
from the point of intersection. The restriction covers any tree, shrub
or natural object over 30 inches above the roadway, located within
the area of the triangle. (See Standard Details[1])
(4)Â
The intersection of any street with a state
or county highway shall conform to the New York State Department of
Transportation's Policy and Standards For Entrances to State Highways
and all county rules and regulations. The applicant shall obtain a
permit from the state or county agency having jurisdiction and submit
a copy of such permit to the Planning Board prior to construction.
E.Â
Cul-de-sac streets. Lane and standard streets that
are not proposed to be through streets shall be terminate in a cul-de-sac.
The cul-de-sac at the end of any lane or street shall be constructed
as shown on the Standard Details[2] and within the following guidelines:
[Amended 12-3-1999 by L.L. No. 33-1999]
(1)Â
Type A cul-de-sac. The Type A cul-de-sac shall
normally be used in all residential subdivisions. The cul-de-sac shall
be constructed so that the turnaround is left with an island of natural
or replanted vegetation (green area) as indicated on the standard
details. Said green area may not be computed as part of the reserved
area requirement.
(2)Â
Type B cul-de-sac. The Type B cul-de-sac shall
normally be used in commercial/industrial subdivisions. The cul-de-sac
shall be constructed so that the turnaround is left with an island
of natural vegetation (green area) as indicated on the Standard Details.
Said green area may not be computed as part of the reserved area requirement.
(3)Â
(Reserved for future use)
(4)Â
Type D cul-de-sac. The Type D cul-de-sac shall
be used to terminate streets in any road improvement plans for old
filed maps. A fifty-foot-diameter fully paved circle shall be used,
as more fully described in the Standard Details.
F.Â
Driveways. (See Standard Details.[3]) When it is necessary to improve a private right-of-way
for access to residential property, the improvements shall be in accordance
with the Standard Detail sheets and the following minimum standards:
[Amended 12-3-1999 by L.L. No. 33-1999]
(1)Â
Width. The width of a driveway serving one,
two, three or four lots varies depending upon the length of said driveway.
(a)Â
Single driveway. The width of a driveway serving
one lot shall be as follows:
|
Length of Driveway
(feet)
|
Cleared Width
(feet)
|
Improved Roadway Width
(feet)
| |
|---|---|---|---|
|
Up to 250
|
16
|
12
| |
|
251 to 500
|
18
|
14
| |
|
501 to 750
|
20
|
16
| |
|
751 or greater
|
22
|
18
|
(b)Â
Common driveway for two lots. The width of a
common driveway serving two lots shall be as follows:
|
Length of Driveway
(feet)
|
Right-of-Way Width
(feet)
|
Cleared Width
(feet)
|
Improved Roadway Width
(feet)
| |
|---|---|---|---|---|
|
Up to 500
|
20 (minimum)
|
18
|
14
| |
|
501 to 750
|
25 (minimum)
|
20
|
16
| |
|
751 or greater
|
25 (minimum)
|
22
|
18
|
(c)Â
Common driveway for three lots. The width of
a common driveway serving three lots shall be as follows:
[Amended 10-19-2015 by L.L. No. 35-2015]
|
Length of Driveway
(feet)
|
Right-of-Way Width
(feet)
|
Cleared Width
(feet)
|
Improved Roadway Width
(feet)
| |
|---|---|---|---|---|
|
Up to 750
|
25 (minimum)
|
20
|
16
| |
|
751 or greater
|
25 (minimum)
|
22
|
18
|
(d)Â
Common driveway for four lots. The width of
a common driveway serving four lots shall be as follows:
|
Length of Driveway
(feet)
|
Right-of-Way Width
(feet)
|
Cleared Width
(feet)
|
Improved Roadway Width
(feet)
| |
|---|---|---|---|---|
|
Any length
|
25 (minimum)
|
22
|
18
|
(2)Â
Alignment. The maximum grade for driveways shall
not exceed 12%, except at street intersections, which shall not exceed
10%.
(3)Â
Drainage. The Planning Board may require the applicant to provide drainage structures on a driveway or a common driveway that gives access to residential property but is privately owned, if the improvement disturbs natural watercourses or recharge areas, or significantly increases runoff to adjacent properties. In such cases the drainage facilities shall be designed to the standard of § 220-3.03.
(4)Â
Common driveway. Common driveways shall be subject
to the following provisions:
(a)Â
All affected property owners shall be jointly
responsible for the maintenance of the common driveway, including,
without limitation, maintenance of the driveway surface and subbase,
maintenance of the drainage structures and the trimming and pruning
of the shoulder areas.
(b)Â
All parking on the commonly used portions of
the driveway is prohibited.
(c)Â
The driveway shall serve no more than four residential
lots.
(d)Â
The common driveway agreement shall be reviewed
and approved by the Planning Board counsel.
(e)Â
All common driveways shall be constructed with
an emergency vehicle turnaround area at the terminus of the driveway
in accordance with the Standard Details. In addition to an emergency
vehicle turnaround area, common driveways greater than 500 feet in
length shall be constructed with a minimum of one interim emergency
vehicle turnoff area. The Planning Board shall seek a written recommendation
from the Fire Department or district having jurisdiction regarding
the location of the interim emergency turn-off area(s). The turn-off
area(s) shall be constructed in accordance with the Standard Details.
(See Standard Details[4])
