| Clue | Source | Date |
|---|---|---|
| Greet with a honk | LA Times Daily | 05 Jan 2022 |
| Greet on the street | LA Times Daily | 11 Nov 2016 |
| Warn with a honk | Universal | 28 May 2016 |
| Warn with a honk | ||
| Greet from behind the wheel | New York Times | 27 Dec 2015 |
| Greet from behind the wheel | ||
| Alert with the horn | ||
| Greet with a honk | ||
| Warn from behind the wheel | ||
| Acknowledge, on the road | ||
| Alert with the horn |