According to the principles of special relativity, if you were traveling at the speed of light, turning on your headlights would not have the expected consequences. This is because, at the speed of light, time dilation and length contraction come into play, leading to some unusual effects.
From your perspective as the traveler, time would appear to stand still, and distances in the direction of your motion would appear contracted to zero. In this scenario, your perception of events would be frozen, and the concept of turning on your headlights would not apply.
However, from the perspective of an observer at rest, witnessing an object with mass traveling at the speed of light is not possible according to our current understanding of physics. Special relativity dictates that an object with mass would require an infinite amount of energy to accelerate to the speed of light, making it impossible to reach or surpass that speed.
It's important to note that the thought experiment of traveling at the speed of light violates the known laws of physics and the principles of special relativity. Therefore, attempting to speculate about the consequences within that scenario may lead to contradictory or inconsistent outcomes.