The clearest image of the moving cars will be produced with the 1/500 second shutter speed.
Faster shutter speeds (like 1/500) capture the motion more effectively, freezing the action and minimizing motion blur. In contrast, slower shutter speeds (like 1/8 or 1/2) are more likely to result in a blurred image of moving subjects. Therefore, for capturing fast-moving objects like cars, the faster shutter speed is preferable.