Table A (below) Design Standards for Streets and Rights-of-way
is primarily based on A Policy on Geometric Design of Highways and
Streets, 1990 edition, from the American Association of State Highway
and Transportation Officials (AASHTO). In the case of any conflict
or needed guidance, the AASHTO policy shall be used.
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Table A
Design Standards for Streets and Rights-of-Way
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---|---|---|---|
Requirement
|
Reference
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Minor Street
|
Principal Street
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Minimum right-of-way width
|
50 feet
|
60 feet
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Travel lanes
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2 @ 13 feet
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2 @ 15 feet
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Minimum pavement width
|
26 feet
|
30 feet
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Minimum grade
|
0.8%
|
0.8%
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Maximum grade
|
8%
|
8%
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Leveling area
|
§ 320-18D(3) and (4)
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2% for 25 feet from an intersection
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2% for 200 feet from an intersection
|
Minimum center line radius
|
100 feet
|
275 feet
| |
Minimum center line tangent length between reverse curves
|
50 feet
|
100 feet
| |
Minimum radius of right-of-way rounding at intersections
|
25 feet
|
25 feet
| |
Minimum stopping sight distance for vertical and horizontal
curves
|
200 feet
|
300 feet
| |
Minimum sight distance at intersections
|
AASHTO
|
200 feet
|
300 feet
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Maximum length of dead-end road
|
600 feet
|
600 feet
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Minimum cul-de-sac ROW radius
|
50 feet
|
50 feet
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Minimum cul-de-sac paved radius
|
40 feet
|
40 feet
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Sidewalk
|
§ 320-18I
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Both sides, 5 feet wide
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Both sides, 5 feet wide
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Wheelchair ramps
|
See MA Arch Access Regulations, CMR 521
|
See MA Arch Access Regulations, CMR 521
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Grass strips
|
See Appendix, Typical Cross-Section
|
6 feet wide
|
6 feet wide
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Tree planting strip
|
§ 320-25A
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6.0 feet wide from back of curb to front edge of sidewalk
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6.0 feet wide from back of curb to front edge of sidewalk
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Soil borings
|
100-foot intervals along road
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100-foot intervals along road
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Drainage calculations
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As required herein
|
As required herein
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