Research Article
Developing an Optimization Model to Manage Unpaved Roads
Table 3
Service level of county unpaved roads.
| Service level | Traffic, vehicles per day | Top width, ft |
| Very high | >400 | ≥28′ | High | 151–400 | 23′–27.5′ | Medium | 51–150 | 18′–22.5′ | Low | 16–50 | 13′–17.5′ | Very low | 5–15 | 10′–12.5′ | None | <5 | ≤8.5′ |
|
|