Schedule of Street Design Standards
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---|---|---|---|---|---|---|---|
Local Streets
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Minor Collector Streets
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Major Collector Streets
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Major Thorough- fares
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Major Arterial Highways
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Nominal traffic capacity (ADT)
|
400
|
1,000
|
2,500
|
10,000
|
--2
| ||
Minimum right-of-way width (feet)
|
50
|
60
|
70
|
100
|
120
| ||
Minimum shade tree and utility easement,
each side (feet)
|
5
|
5
|
5
|
5
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--
| ||
Minimum paving width (feet):
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Two-way
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30
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40
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50
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60
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--2
| ||
One-way
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22
|
--
|
--
|
--
|
--
| ||
Shoulder or parking- area width1
|
--
|
--
|
--
|
2 at 8 ft.
|
--2
| ||
Two-way
|
30
|
40
|
50
|
60
|
--2
| ||
One-way
|
22
|
--
|
--
|
--
|
--
| ||
Sidewalks:
| |||||||
Width
|
4
|
4
|
4
|
4
|
--
| ||
Setback (from face of curb)
|
3
|
4
|
5
|
7
|
--
| ||
Design speed (miles per hour3)
|
40
|
40
|
50
|
60
|
60
| ||
Minimum radius of horizontal curvature
at center line
|
150
|
500
|
750
|
2,000
|
2,000
| ||
Minimum tangent between reverse curbs
|
100
|
200
|
4004
|
6004
|
42
| ||
Maximum longitudinal grade (percent)
|
8
|
8
|
6
|
4
|
4
| ||
Minimum longitudinal grade (percent):
| |||||||
Desirable
|
0.75
|
0.75
|
0.75
|
0.75
|
0.75
| ||
Absolute
|
0.50
|
0.50
|
0.50
|
0.50
|
0.50
| ||
Maximum longitudinal grade for 200
feet from each side of intersection (percent)
|
3.5
|
--
|
2.5
|
--
|
--
| ||
Minimum curb return radius at intersection9
|
15
|
25
|
25
|
45
|
45
| ||
Vertical curve5
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Crest: Minimum length equals 100 feet,
based on stopping sight distance or design speed.
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Sag: Minimum length equals 100 feet,
based on headlight illumination and stopping sight distance or design
speed.
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Maximum super- elevation (percent)
|
Not required
|
Not required
|
6
|
6
|
6
| ||
Pavement cross-slope, minimum (percent)
|
2.947
|
3.19
|
2
|
1 1/28
|
--2
| ||
Pavement cross-slope, maximum (percent)
|
2.947
|
3.198
|
4
|
3
|
--2
| ||
Curbface required (inches)6
|
6
|
8
|
8
|
8
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--2
| ||
Minimum property line corner radius
(feet)9
|
7
|
15
|
15
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30
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--2
| ||
NOTES:
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1 Shoulders
or parking areas as required may be of reduced structural design.
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2 To be
individually designed based on traffic projections and on design standards
of the American Association of State Highway Officials. Design to
meet at least major thoroughfare standards.
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3 For sight
distance and vertical curve calculations only.
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4 Or as
required to run out superelevation (1% per second of travel at design
speed).
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5 Not required
if algebraic difference of intersecting grades does not exceed one.
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6 Except
in superelevation areas.
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7 Six-inch
crown.
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8 Eight-inch
crown.
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9 When dissimilar
streets interest, the larger radius will be used.
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Classification, Fully Developed
|
Range of Coefficient
| |
---|---|---|
Public parks, open space and land conservation
|
0.15 to 0.30
| |
Low-density residential
|
0.30 to 0.45
| |
Medium-density residential
|
0.40 to 0.60
| |
High-density residential
|
0.55 to 0.70
| |
Commercial and industrial
|
0.60 to 0.90
| |
Pavements, roadways and shoulders
|
1.00
|