The time of a traveler at speed of light
ct'= (ct - xv/c)/sqrt(1 - v^2/c^2)
has actualy stopped, if you (standing at still or at a velocity less than c) would see
>>1 's clock, it would never move forward. Therefore, how would he see his headlights while traveling at c? He could not. Because while traveling at c your time has stopped, so you can't see shit until you slow down.
>>6
The same instant where you reach speed of ligth (from the traveler's point of view) you would crash in a planet/star, jump outside the universe or fly forever.