If you are driving a car with the speed of light, what happens when you turn on the headlights?
113625
The car, you, and the headlights would no longer exist.  Light would continue at its usual speed.
64267
Well, if you're traveling faster than light, then the light can never be in front of you.  There would be just a big nothing, probably drive you crazy if you looked at it.  I know, I come from andromeda.  We travel through space backwards so we can see where we're going.
219832
The speed of light is indeed a constant.  What's important is that it is a constant to every observer.  If you are traveling toward a light source at 1000 m/s, you will measure the light's velocity at 300,000 m/s.  If you are traveling AWAY from the light source, it will still measure 300,000 m/s.\n\nLight IS the absolute speed limit. (Of this universe anyway)
25198
You can't be in a vehicle going the speed of light, because as objects accelerate they gain mass and a car going the speed of light would be insanely massive.
302939
are you referring to after you turn the vehicle off ?\ni know my car will keep the headlights on for 30 seconds after it's turned off if i turn the headlights off AFTER the car has been shut off.
670589
Forever and ever.\nIt may get dimmer, but that is from the spreading of the light.  The photons will travel until they collide with something.
236873
According to Einsteinian theory, yes, you would see the light.  Einstein postulates that the speed of light is relative to the viewer.  If you were travelling at the speed of light and turned on a flashlight, the light traveling out of the flash light would be traveling away from you at the speed of light relative to you.
293728
At the speed of light you gain infinite mass so the light beam from a headlight must go faster than light to escape the headlight it's self.If the beam could be a higher energy of light like gamma rays and if you could see a gamma ray which human eyes can't then maybe you'd see something. The question is will they come on,yes because\nthe electricity will flow through the filament of the bulb so it's on but can you tell by eye?No,because it would take forever for the light to reach your eye at equal speeds.
998287
Well, when I drive the speed of light in my car... \n\nI think the person in front of you would see that they're on, but they wouldn't illuminate anything.
228021
Some people would argue the logic of a space craft having headlights at all, others might find fault in the fact that, physically, nothing with mass can ever travel at the speed of light.  But lets put that aside.\n\nThe speed of light is constant in any frame of reference, no matter who is "watching" it, it always travels with respect to them at the speed of light (c).\n\nIf you are in a space ship already traveling at the speed of light [with respect to some outside observer], when you turn on the headlights, the light will move away from you at the speed of light.\nIf some outside observer (who you are flying past at the speed of light) watches all this, they would, too, see the light travel at c with respect to them.  But since you and the light are traveling both at the speed of light with respect to the observer, you and the light would be keeping up with eachother.
1075094
Of course they'll work. The question is if you will see them. You can't travel at the speed of light, anyway, or physics is wrong, so nobody would be able to give you an answer. \n\nAssuming you were just really close to the speed of light, you would still see them. Einstein discovered that the speed of light in a vacuum is constant to ALL observers, no matter how fast the source of light is going relative to the observer. So at any speed, you can see your headlights just fine.
35130
Zero....Illumination is tracked by the speed of light but the lack of illumination means that nothing is moving.
979220
Albert Einstein answered this question a long time ago.  He theorized (and every experiment since then has borne him out) that the speed of light is constant from ANY inertial (non-accelerating) frame of reference.  This includes the speed of light relative to your headlights.  \n\nLight speed is constant.  What changes is time and length.  Weird but true.
859647
The speed of light is an illusion imposed upon us by the Almighty. He lets you see the light whenever He wants you to.
163148
Nothing happens, the car lights will travel at the speed of light in comparasion to the car. This doesn`t mean that the lights will travel twice as fast, you cannot add this velocities without taking into account Lorentz equations.\n\nIs it deja-vou or is it the third time this question has been asked?
226867
The speed of light. 186,000 miles per second.
757296
There are some good answers and out right crazy ones.  First off you stated the car was in a vacum.  Well light is seen only when something reflects it.  A true vacum is empty. So no light at all even if you are going 1 mph or standing still.  Also if you were not in a true vacum then you will still see the light.  Pilot going super sonic speeds can still hear no diffrent than a fly in a car going 50 miles an hour. he is going 50 miles an hour too although he is only buzzing around the car.  Image this if you jump off train going 100 mph.  We know that you cannot jump 100mph however you manage to jump away from the 100 mph train.  at this point your were jumping 100mph plus what ever your speed id while jumping.