| Clue | Source | Date |
|---|---|---|
| Major rds. | Newsday | 15 Mar 2024 |
| 'I-' rds., e.g | The Washington Post | 02 Dec 2019 |
| "I-" rds., e.g | LA Times Daily | 02 Dec 2019 |
| Interstate rds | The Washington Post | 02 Sep 2019 |
| Interstate rds | LA Times Daily | 02 Sep 2019 |
| Numbered rds | Universal | 20 Mar 2019 |
| Numbered rds. | ||
| Interstate rds. | ||
| Limited-access rds | Newsday | 31 Dec 2015 |
| Major rtes | Wall Street Journal | 26 Dec 2015 |
| Major rtes | Premier Sunday | 12 Jul 2015 |
| Limited-access rds. | ||
| Major rtes. | ||
| Major rtes. | ||
| Major rds. | ||
| Major rds. | ||
| Some map lines: Abbr. | ||
| Major rtes. | ||
| Rtes. | ||
| Major rtes. | ||
| Major rtes. | ||
| Some GPS routes | ||
| DOT concerns | ||
| Interstates, e.g.: Abbr. | ||
| I-15 and I-40, e.g. | ||
| I-15 and I-40, e.g. | ||
| Major rtes. | ||
| Jct. joiners | ||
| Heavy lines on maps: Abbr. | ||
| Rds. without traffic lights | ||
| Major rtes. | ||
| Rte. 66 and others | ||
| Numbered rds. | ||
| Vacation rtes. | ||
| Major rds. | ||
| Major rds. | ||
| Roads with nos. | ||
| Major rtes. | ||
| AAA abbreviations | ||
| Cousins of rtes. |