| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 0 |
0%
|
| 2 | Very poor | 88 |
7.3%
|
| 3 | Poor | 96 |
8%
|
| 4 | Fair | 136 |
11.3%
|
| 5 | Good | 424 |
35.3%
|
| 6 | Very good | 456 |
38%
|