According to Einstien, it's physically impossible to have an object move at the speed of light other than light itself. But let's say I did have such a vehicle. From my point of view within the car, I would see the headlights shine from the front of the car as it normally would. But from someone else's view, say from the side of the road, they would see the headlights turn on at the front of the car, but there wouldn't be a light beam illuminating the road in front of me.