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Hi Mick,
Once again please feel free to correct me if I am missing something, but the speed of light is always the speed of light, regardless of your speed. Meaning the speed of light doesn't add itself to your own speed. If you were moving at 100km/hr and turn your lights on, the light coming from your car isn't C+100km/hr it is still C. Therefore if you are moving at the speed of light, you wouldn't see any light at all because it cannot get out in front of you because you are moving at the same speed.
In fact to be perfectly correct, in the scenario described in the above posts, the observers wouldn't see your lights come on at all, because you and the light from your headlights would arrive at exactly the same time.......I think?
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