Design Standards
| ||||||
---|---|---|---|---|---|---|
Type of Street
|
Minimum ROW
(feet)
|
Minimum Cartway Width
(feet)
|
Maximum Grade
(percent)
|
Minimum Grade
(percent)
|
Minimum Radii Center Line
(feet)
|
Minimum Sight District
(feet)
|
Major thoroughfare
|
80
|
36
|
5.0%
|
0.5%
|
500
|
400
|
Collector streets
|
70
|
32
|
7.5%
|
0.5%
|
400
|
300
|
Local streets
|
60
|
28
|
10.0%
|
0.5%
|
200
|
200
|
Marginal access streets
|
50
|
24
|
10.0%
|
0.5%
|
100
|
100
|
Alleys
|
20
|
20
|
10.0%
|
0.5%
|
50
|
50
|
Crosswalks
|
12
|
8
|
—
|
—
|
—
|
—
|
NOTES:
| |
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1)
|
Additional widths may be required upon findings that
the same are required for: a) public safety and convenience; b) parking
in commercial or public use areas; c) existing street, alley or crosswalk
rights-of-way which do not provide the above-mentioned minimum widths,
and where, as a consequence, additional dedication is necessary.
|
2)
|
Sight distance shall be measured along the center line
at eye level. Proper sight lines should be maintained at all intersections
or streets. Measured along the center line, there should be a clear
sight triangle the specified sight distance from the point of intersection.
No future building or obstruction shall be permitted in this area.
|
3)
|
Cul-de-sac streets shall be designed with a turnaround
having a minimum outside cartway diameter of 100 feet and a minimum
property line diameter of 120 feet. Cul-de-sac streets are only permitted
to serve light industrial developments.
|