Division by zero in operator /

Well that's one in a million probability. Do you recall what line it occurred and in what script?

Was it in the _physics_process() of car.gd? Cause if so, I think I may have also found the error after messing with the controls

I experience the same thing. It appears to be on the part where you have max_steering_angle and try to divide 90.0/max_steering_angle which can be 0 if i press the steering and then release it, so every time one tries to turn, they get this error.