Functional Classification (0)
| Interstate |
| Principal Arterial - Other Freeways or Expressways |
| Principal Arterial - Other |
| Minor Arterial |
| Major Collector |
| Minor Collector |
| Local |
National Highway System (NHS) (1)
| Eisenhower Interstate System |
| Other NHS |
| Non-Interstate STRAHNET |
| Major STRAHNET Connector |
| Intermodal Connector |
| MAP-21 Principal Arterial |
Strategic Highway Network (STRAHNET) (2)
| Regular STRAHNET |
| Connector |
Urban Limits (3)
| Urban Cluster (2500-4999) |
| Small Urban (5000-49,999) |
|
| Urbanized Area (50,000+) |
| <all other values> |
|