| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 0 |
0%
|
| 2 | Very poor | 0 |
0%
|
| 3 | Poor | 0 |
0%
|
| 4 | Fair | 32 |
2.7%
|
| 5 | Good | 840 |
70%
|
| 6 | Very good | 328 |
27.3%
|