| Rtes. |
| Major rds. |
| Major rtes. |
| DOT concerns |
| Jct. joiners |
| Numbered rds. |
| Some GPS routes |
| Roads with nos. |
| Cousins of rtes. |
| Rte. 66 and others |
| Interstates: abbr. |
| I-15 and I-40, e.g. |
| Limited-access rds. |
| Some map lines: Abbr. |
| Interstates, e.g.: Abbr. |
| Heavy lines on maps: Abbr. |
| Rds. without traffic lights |