| Value | Category | Cases | |
|---|---|---|---|
| -3 | illegal missing | 0 |
0%
|
| -2 | dont know | 0 |
0%
|
| -1 | refuse | 0 |
0%
|
| 1 | Paved, multi-lane in each direction | 0 |
0%
|
| 2 | Paved, single-lane in each direction | 0 |
0%
|
| 3 | Gravel | 8 |
34.8%
|
| 4 | Dirt | 15 |
65.2%
|
| Sysmiss | 1002 |