It totally shouldn't accelerate if the wheels aren't touching the ground. And judging on how the wheels are hanging in your screenshot as if suspension is totally extended, it can be as well that it thinks that it's not touching the ground. But this exact code is built in the game engine, so I it would be tricky to investigate. Maybe I'll just respawn it higher and let it fall and it would fix the issue. But I still can't really reproduce it now, so even after doing the change I wouldn't know if it's ok
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Here's the test page, password protected:123
https://no-login-found.itch.io/test
The car is heavier as several players requested, with lower center of mass, so it should be harder to flip. It's also respawned 1m above the 'valid place', so probably would solve the issue with 'in-the-ground-not-moving'.
Thanks very much for your help