| Clue | Source | Date |
|---|---|---|
| Autonomous vehicle | USA Today | 25 Nov 2021 |
| Something for which a dealer might tell customers 'Hands off!' | New York Times | 26 Dec 2020 |
| Experimental vehicle | LA Times Daily | 20 Oct 2018 |
| Experimental vehicle | The Washington Post | 20 Oct 2018 |
| Experimental vehicle |