Thrusters pointed straight back will be illegal on public roads and racetracks, as they'd throw debris at people and cars behind them. However, pointing them upward and forward could give them a chance of being legal and functional, especially for braking.

Gemini 4 Argon: https://x.com/LechMazur/status/2111255403216384046 GPT-6 Pro: https://x.com/LechMazur/status/2111255536666644932 Opus 5.5: https://x.com/LechMazur/status/2111258566539493402