@jd It's fun... but, every time I see it, I can't help mentioning: while colours are "correct", the lengths (etc.) are not.

Just talking 1D, the oncoming car should be longer, the receding car shorter (shorter than the usual length contraction).

Also, the oncoming car should be brighter, receding dimmer (relativistic beaming).

In 3D also other effects e.g. "Terrell rotation".

To see the full range of effects one can play the MIT game "A Slower Speed of Light":

http://gamelab.mit.edu/games/a-slower-speed-of-light/