Table 4.5. Maximum Vertical Grades |
|
Maximum Grade (%) for Specified Design Speed (mph) |
15 |
20 |
25 |
30 |
35 |
40 |
45 |
50 |
55 |
60 |
65 |
70 |
75 |
80 |
Industrial Roadways |
Level
Rolling
Mountainous |
-
-
- |
-
-
-
|
4
5
6 |
4
5
6
|
4
5
6
|
4
5
6
|
3
4
5 |
3
4
5
|
3
4
5
|
3
4
5
|
-
-
- |
-
-
- |
-
-
- |
-
-
- |
Local Rural Roads |
Level
Rolling
Mountainous |
9
12
17 |
8
11
16 |
7
11
15 |
7
10
14 |
7
10
13 |
7
10
12 |
7
9
11 |
6
8
10 |
6
7
10 |
5
6
- |
-
-
- |
-
-
- |
-
-
- |
-
-
- |
Local Urban Streets |
Level
Rolling
Mountainous |
12
14
17 |
11
13
16 |
11
12
15 |
10
11
14 |
10
11
13 |
9
10
12 |
9
10
11 |
8
9
- |
8
-
- |
-
-
- |
-
-
- |
-
-
- |
-
-
- |
-
-
- |
Rural Collectors |
Level
Rolling
Mountainous |
-
-
- |
7
10
12 |
7
10
11 |
7
9
10 |
7
9
10 |
7
8
10 |
7
8
10 |
6
7
9 |
6
7
9 |
5
6
8 |
-
-
- |
-
-
- |
-
-
- |
-
-
- |
Urban Collectors |
Level
Rolling
Mountainous |
-
-
- |
9
12
14 |
9
12
13 |
9
11
12 |
9
10
12 |
9
10
12 |
8
9
11 |
7
8
10 |
7
8
10 |
6
7
9 |
-
-
- |
-
-
- |
- |
-
-
- |
Rural Arterials |
Level
Rolling
Mountainous |
-
-
- |
-
-
- |
-
-
- |
-
-
- |
-
-
- |
5
6
8 |
5
6
7 |
4
5
7 |
4
5
6 |
3
4
6 |
3
4
5 |
3
4
5 |
3
4
5 |
3
4
5 |
Urban Arterials |
Level
Rolling
Mountainous |
-
-
- |
-
-
- |
-
-
- |
8
9
11 |
7
8
10 |
7
8
10 |
6
7
9 |
6
7
9 |
5
6
8 |
5
6
8 |
-
-
- |
-
-
- |
-
-
- |
-
-
- |
Rural and Urban Freeways (Limited Access Facilities) |
Level
Rolling
Mountainous |
-
-
- |
-
-
- |
-
-
- |
-
-
- |
-
-
- |
-
-
- |
-
-
- |
4
5
6 |
4
5
6 |
3
4
6 |
3
4
5 |
3
4
5 |
3
4
- |
3
4
- |