Idaho National Highway System (10)
| Eisenhower Interstate System |
| Non-Interstate STRAHNET |
| Major STRAHNET Connector |
| Other NHS |
| Intermodal Connector |
| MAP-21 Principal Arterial |
Interstate (0)
Other Freeway or Expressway (1)
Other Principal Arterial (2)
Minor Arterial (3)
Major Collector (4)
Minor Collector (5)
Statewide Functional Class (9)
| Interstate |
| Other Freeways or Expressways |
| Other Principal Arterials |
| Minor Arterial |
| Major Collector |
| Minor Collector |
Federal Aid (11)
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