Because of time compression/dilation (depending on your point of view). To you, outside the situation, time for the car does not appear to be advancing i.e. it is frozen.
“Because of time compression/dilation (depending on your point of view). To you, outside the situation, time for the car does not appear to be advancing i.e. it is frozen.”
It is all relative. You assumed a frame of reference (you) by giving it a speed.
If you see it traveling fast, it cannot seem to be frozen to you!