Table 1
Rural Low-Volume Road Classification
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Road Use
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Guidelines
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Road Classification
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Vehicle Type
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ADT(1)
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Rehabilitation Design Type
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Maintenance
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Traffic Control
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1. Low-volume collector
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All vehicles
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50 to 400
Less than 50
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A
B
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Normal
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MUTCD(2)
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2. Residential access
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Cars, emergency and service vehicles
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50 to 400
Less than 50
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B
C
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Normal
Normal
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MUTCD
MUTCD
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3. Farm access
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Cars, light trucks, occasional heavy trucks, farm equipment
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250 to 400
Less than 250
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A
B
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Normal
Normal
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MUTCD
MUTCD
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4. Resource/industrial access
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Trucking employee's cars
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50 to 400
Less than 50
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A
B
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Normal
Normal
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MUTCD
MUTCD
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5. Agricultural land access
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Occasional farm equipment seasonal
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—
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C
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Minimum maintenance
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MUTCD
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6. Recreational land access
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Cars, RVs, seasonal
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50 to 400
Less than 50
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B
C
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Normal
Minimum maintenance
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MUTCD
MUTCD
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NOTES:
(1) Average
daily traffic.
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(2) "Manual
of Uniform Traffic Control Devices" supplemented by "Traffic Sign
Handbook for Low Volume Roads" New York State Department of Transportation,
Traffic and Safety Division, June 1985.
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Table 2
Design Guidelines for Road Rehabilitation by
Road Type
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---|---|---|---|
Type A All Purpose Road
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Type B Area Service Two-Way Two-Lane Road
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Type C Area Service Single Lane Two-Way Road
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Minimum width traveled way
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18 feet(1)
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16 feet(1)
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10 feet(2)
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Shoulder
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2 feet
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2 feet
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Opposing vehicle interactions
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All vehicles pass with no speed reductions
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1. Trucks cannot meet without reducing speed
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All vehicles require special widening for passing
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2. Cars cannot meet trucks without reducing speed
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3. Cars pass with almost normal speed
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Operating speed(3)
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45 mph or greater
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25 mph to 45 mph
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40 mph or less
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Typical surface material(4)
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Asphaltic concrete ADT greater than 150
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Asphaltic concrete ADT greater than 150
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Usually unsurfaced
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Aggregate ADT less than 150
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Aggregate ADT less than 150
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Surface condition
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No adverse effect on operating speed
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May cause reduction in operating speed
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Reduced operating speed
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NOTES:
(1) Add two feet to the
traveled way if significant truck traffic is present.
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(2) If farm vehicles are
present, maintain a twenty-foot horizontal clearance. Widening of
traveled way should be provided at approximately one-thousand-foot
intervals to allow vehicles to pass.
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(3) Applicable to normal
maintenance roads.
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(4) ADT thresholds recommended
based on economic analysis, "Economic Evaluation of Pavement Design
for Low Volume Roads," Processing of the Third International Low Volume
Road Conference 1983, Cornell University.
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Table 3
Cross Slope Drainage Criteria by Surface
Type
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---|---|---|
Surface Type
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Range in Cross Slope
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High (asphalt, etc.)
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1.5% - 2.0%
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Intermediate (surface treated)
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1.5% - 3.0%
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Low (unpaved)
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4.0% - 6.0%
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Clear zone: The width of the roadside area that
should be studied for possible hazard mitigation measures varies with
the operating speed, traffic level and degree of curvature of the
road. Desirable clear zones are indicated below. (Clear zone is measured
from the edge of the traveled way.)
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Type A road: A ten-foot clear zone is desirable.
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Type B road: A two-foot to five-foot
clear zone is desirable; a ten-foot clear zone on the outside of sharp
curves and on curves at the bottom of long grades is desirable.
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Type C road: A two-foot clear zone
is desirable; a wider clear zone on the outside of sharp curves is
suggested. On minimum maintenance roads a clear zone may not be provided.
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Hazard mitigation measures to be considered
include:
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Improved delineation of the road including edge
lines, delineators and reflectors.
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Guide rail.
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Berms and earth work.
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Drainage modifications.
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Removal of the hazard.
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Property owners should recognize the legal right
of local government to remove fixed objects within the right-of-way
of the road.
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Guide rail. New York
State Department of Transportation guide rail and bridge rail designs
are intended for high-volume, high-speed highways and are often too
expensive for many low-volume road applications. Alternative designs
that are less expensive and adequately tested to assure performance
may be used on low-volume roads.
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Source: AASHTO Policy
for Geometric Design of Highways and Streets, 1984.
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Table 4
Maintenance Activities for Low-Volume
Activities and Minimum Maintenance Town Roads
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---|---|---|
Activity
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Normal Maintenance Roads
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Minimum Maintenance Roads
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Surface Maintenance
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Crack sealing
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As necessary
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Maintain in manner determined by Town Highway Superintendent consistent with volume and type of traffic and in the manner stated in § 130-7 of this chapter
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Patching and potholes
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On demand
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Surface seals
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As necessary
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Thin overlays
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As necessary
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Snow removal
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Roads kept clear
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Shoulder maintenance
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Grading cleaning
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Blading
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Regular
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Infrequent
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Roadside Maintenance
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Cleaning
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As necessary
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Maintain in manner determined by Town Highway Superintendent consistent with volume and type of traffic and in the manner stated in § 130-7 of this chapter
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Mowing
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Regular
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Brush control
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Site distance maintained
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Guide rail maintenance
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Regular
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Drainage:
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- Structure
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As necessary
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- Ditches
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Positive drainage maintained
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Slopes
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Repair failures
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Bridges
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Cleaning
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As necessary to preserve bridge
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Maintain in manner determined by Town Highway Superintendent consistent with volume and type of traffic and in the manner stated in § 130-7 of this chapter
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Lubrication
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As necessary to preserve bridge
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Painting
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As necessary to preserve bridge
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Deck
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As necessary to preserve bridge
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Drainage
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As necessary to preserve bridge
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Signs
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Signs
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MUTCD(1)
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MUTCD(1)
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NOTES:
(1) MUTCD is the
Manual of Uniform Traffic Control Devices.
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