This week's book giveaway is in the Other Open Source APIs forum. We're giving away four copies of Storm Applied and have Sean Allen, Peter Pathirana & Matthew Jankowski on-line! See this thread for details.
I think the light from your head lights would be moving at the speed of light relative to you - or 2x speed of light to a stationary observer. You would still see your headlights just like normal.
I am justifying this with this example - but I may be missing a fundamental understanding of relativity here: If you are driving your car at 50mph and throw an apple out the window at 10mph - the apple is travelling at 10mph relative to you (it will still move away from you at 10mph) - but if the apple hits a stationary observer - they are hit by an apple travelling 60mph [ October 06, 2005: Message edited by: Rick Beaver ]