| Clue | Source | Date |
|---|---|---|
| Cause of a slowdown on the road? | ||
| Traffic signal to slow down | Newsday | 01 Oct 2024 |
| Street warning | LA Times Daily | 01 Aug 2021 |
| Street warning | The Washington Post | 01 Aug 2021 |
| Traffic signal component | USA Today | 31 Dec 2020 |
| *Caution to slow down | New York Times | 19 Mar 2018 |
| *Caution to slow down | ||
| This should slow you down | ||
| Driver's warning signal | ||
| It's forever amber |