Does a car provide adequate protection from small-arms fire?
Here is a car that’s been shot -
But, you say, maybe the bullets were stopped. They obviously went through the outer skin, but surely that stopped them.
Here is a view from the other side (different car, but obviously exit holes. -
Change “adequate protection” to “any real protection” and the answer is still no. It’s better than nothing, maybe, but you’d better get behind the engine block or the wheels, because unless the bullets hit the frame, the overall structure isn’t going to stop much beyond a .22