Standard
|
Major Street
|
Minor Street
| |
---|---|---|---|
Right-of-way width
|
60 feet
|
50 feet
| |
Minimum travel surface width
|
30 feet
|
20 feet
| |
Minimum pavement width (where required)
|
24 feet
|
18 feet
| |
Minimum pavement depth, total (after compaction)
|
4 inches
|
3 1/4 inches
| |
Surface course
|
1 1/2 inches
|
1 1/2 inches
| |
Base course
|
2 1/2 inches
|
1 3/4 inches
| |
Thickness of aggregate base
| |||
Subbase course (maximum stone 4 inches)
|
24 inches
|
18 inches
| |
Crushed base course
|
6 inches
|
3 inches
| |
Minimum grade
|
0.5%
|
0.5%
| |
Maximum grade
|
5%
|
8%
| |
Minimum radius of horizontal curves at center line
|
400 feet
|
230 feet
| |
Minimum tangent between reverse curves
|
200 feet
|
100 feet
|