This Part 2 is enacted to ensure all streets,
highways and other improvements constructed within the Town of Liberty
offered for dedication to the Town or intended to be private in use
meet the standards contained herein and have been reviewed and approved
by the Town Engineer and the Town Highway Superintendent.
Streets, highways and improvements constructed
within and for dedication to the Town of Liberty or to remain private
in use shall be constructed to the standards contained in this section
and the laws, rules and regulations of the Town of Liberty pertaining
to the subdivision of land. In the event of any inconsistency between the standards
of this section and the subdivision laws, rules and regulations, the
more stringent standard shall apply.
A. Rights-of-way. Rights-of-way shall be provided as
follows for streets, highways or roads as defined by the subdivision
laws, rules and regulations:
|
Type of Road
|
Minimum Width
(feet)
|
---|
|
Major
|
60
|
|
Collector
|
50
|
|
Minor
|
50
|
B. Geometric requirements.
(1) All streets, highways and roads shall be designed
following generally accepted highway engineering principles.
(2) Street jogs with center-line offsets of less than
125 feet shall be avoided.
(3) In general, all streets, highways and roads shall
intersect each other so that, for a distance of at least 150 feet,
the street, highway or road is approximately at right angles to the
street, highway or road it intersects.
(4) The street, highway or improvement plan shall bear
a logical relationship to the topography of the property and, if building
sites are proposed along said proposed street, highway or improvements,
it shall be arranged so as to obtain as many of the building sites
as possible at or above the grade of the streets.
(5) Street, highway or road grades.
(a)
Profiles.
[1]
No grade shall be less than 0.5% or exceed the
following, with due allowances for reasonable vertical curves:
|
Type of Road
|
Maximum Grade
|
---|
|
Major traffic streets, highways and roads
|
6% (up to 8% for 250 feet)
|
|
Collector streets
|
8% (up to 10% for 250 feet)
|
|
Minor streets, highways and roads
|
10% (up to 12% for 250 feet)
|
[2]
Streets, highways and roads shall have a grade
not to exceed 3% for a distance within 75 feet of the right-of-way
line of any intersecting street, highway or road.
(b)
Cross section. All roads will be constructed
to the requirements of the attached typical cross section. The gradients of streets, highways and roads shall be
no less than 0.5% without curbs and gutters and 0.3% with curbs and
gutters. The Town Engineer may require that super elevations be incorporated
in horizontal curves.
(c)
Minimum vertical and horizontal visibility (measured
3.75 feet eye level to stationary object 0.5 feet above ground level)
for curves:
|
Type of Road
|
Minimum Visibility
(feet)
|
---|
|
Major streets, highways and roads
|
500
|
|
Collector streets, highways and roads
|
300
|
|
Minor streets, highways and roads
|
300
|
|
Streets, highways and roads shorter than 500
feet
|
150
|
(6) All right-of-way lines at intersections shall be rounded
by curves of at least a twenty-foot radius, and curbs, if required,
shall be adjusted accordingly.
(7) A tangent of at least 100 feet shall be introduced
between reversed curves on all streets, highways and roads.
(8) All dead-end streets, highways and roads intended
to remain so permanently and such others as may be designated by the
Town Highway Superintendent and/or Town Engineer shall terminate in
a surfaced circular turnaround having a minimum pavement radius of
60 feet with a minimum right-of-way radius of 70 feet.
C. Construction of roadway.
(1) General.
(a)
The applicant shall establish and clearly mark
the side of the limits of the right-of-way and location and elevation
of drainage structures. Such markers shall be maintained at the applicant's
expense until construction of the roadway, drainage and shoulder have
been completed and accepted by the Town of Liberty.
(b)
Monuments. Concrete monuments or other permanent
markers shall be installed every 300 feet on both sides of the right-of-way
and all property lines.
(c)
Unless otherwise directed, in writing, by the
Town Highway Superintendent and/or Town Engineer, final grading of
the right-of-way and construction of pavement shall be delayed until
all utilities, including house connections, have been installed and
backfill in trenches has been thoroughly compacted. Earth shoulders
and flow lines of ditches shall be maintained at all times at the
applicant's expense during the course of construction.
(d)
Samples of materials to be used in the construction
of the roadway shall be furnished to the Town Highway Superintendent
and/or Town Engineer. The applicant shall be required to pay for any
standard engineering tests which the Town Highway Superintendent shall
deem necessary.
(e)
The Town Highway Superintendent and/or Town
Engineer shall be granted full access to any construction taking place
under these specifications and shall be allowed to take any standard
engineering field test which may be appropriate.
(f)
All thicknesses called for are compact thicknesses.
(g)
The roadway shall be constructed as shown on
a typical section provided to the applicant by the Town Highway Superintendent
and/or Town Engineer and incorporated herein as Schedule A.
(h)
Guide rails shall be installed at locations
directed by the Town Highway Superintendent and/or Town Engineer in
accordance with the New York State Department of Transportation standards
in effect at the time of installation.
(i)
All signs installed shall be in conformance
with the New York State Manual of Uniform Traffic Control Devices.
(2) Earthwork.
(a)
Clearing and grubbing.
[1]
Clearing and grubbing shall consist of clearing
the area of all vegetation and shall be limited to that area to be
covered by the roadway proper, shoulders, side slopes and ditches.
[2]
All cleared material shall be removed from the
development or otherwise disposed of in a manner approved by the Town
Board.
(b)
Subgrade. Prior to any excavation and/or embankment
operation, all soil erosion and control measures shall be installed
in accordance with the subdivision plans, the stormwater pollution
prevention plan and to the satisfaction of the Town Highway Superintendent
and/or Town Engineer. The subgrade prior to placement of the subgrade
shall meet the requirements of § 203-2.02 of the New York
State Department of Transportation Standard Specifications. All rock
and boulders larger than six inches in diameter shall be excavated
12 inches below finished subgrade of the roadway. All topsoil or otherwise
soft or unstable material, including organic or frozen material, shall
be removed from within the roadway, shoulders and ditches and shall
be replaced with suitable borrow. Fill required to complete the approved
grades shall be acceptable to the Town Highway Superintendent and/or
Town Engineer.
[1]
The shape of the subgrade shall conform to the
typical cross sections herein attached.
[2]
If the subgrade preparation is deemed insufficient
in specific areas, the Town Highway Superintendent and/or Town Engineer
may require those areas to be removed and replaced with suitable materials,
the installation of geotextile stabilization or filter fabric and
the placement of underdrains.
(c)
Road section. The road section will be in conformance
with the typical sections herein attached.
(d)
Subbase. The subbase shall be 12 inches thick
consisting of an eight-inch bottom course meeting NYSDOT Subbase Course
Type 3 and a four-inch top course meeting NYSDOT Subbase Course Type
2. The subbase shall not be installed during rain, when the subgrade
is wet, or when the subgrade is frozen. The subbase will be thoroughly
compacted. The Town Highway Superintendent and/or Town Engineer shall
require compaction tests to be conducted at the owner's expense.
(e)
Surfacing. Travel lanes (10 feet wide each)
shall be surfaced with five inches of hot-mix asphalt concrete. The
bottom course shall consist of three inches of NYSDOT Type 3 binder.
The top course shall consist of two inches of NYSDOT Type 6 top. Shoulders
will be surfaced with NYSDOT Type 2 subbase material. All surfaces
will be thoroughly compacted. After placement of the asphalt concrete
pavement, the Town Highway Superintendent and/or Town Engineer shall
require, at the owner's expense, corings be taken to insure the proper
thickness of the road section. Construction not meeting the typical
cross section will be rejected.
(3) Design and construction of drainage structures.
(a)
All drainage facilities with a waterway area
of 25 square feet or less shall be designed to accommodate runoff
for a storm of ten-year frequency.
(b)
Drainage structures with a waterway area over
25 square feet will be designed by a professional engineer and shall
be capable of carrying the runoff from a storm of twenty-year frequency.
(c)
In no event shall the diameter of a sluice pipe
be less than 15 inches.
(d)
Drainage channels shall be designed following
generally accepted hydraulic engineering principles. Channels shall
be normally of trapezoidal cross section with side slopes of two feet
on one foot.
(e)
The banks on both sides of drainage facilities
and bridges servicing a stream or larger water source shall have rip-rapped
construction of the banks beyond the head walls. The amount of rip-rap
required shall be determined by the Town Highway Superintendent.
(f)
Material used for drainage structures shall
be approved by the Town Highway Superintendent and/or Town Engineer.
(4) Turf establishment. All disturbed areas shall be designated
for turf establishment. All disturbed areas will be seeded within
three weeks after reaching final grade.
(5) Signs and street names. Any proposed street name shall
be approved by the Town Board of the Town of Liberty. In general,
streets shall have names and not numbers or letters. The applicant
shall pay for the cost of obtaining and installing approved street
signs and sign posts.
(6) Utilities.
(a)
Wherever possible, utilities shall be underground
and shall be placed in the street right-of-way between the ditches
and outside boundary of the right-of-way to simplify location and
repair of lines when they require attention.
(b)
Whenever it is necessary that utilities cross
the roadway, they shall do so at a right angle to the roadway.
D. Variations. Variations to the standards contained
herein may be approved by the Town Board on the recommendation of
the Town Highway Superintendent in cases where unreasonable hardship
would result from strict application of the standard, the level of
traffic and use would warrant a lesser standard or the interests of
safety would be better served by a different standard.