Would headlights be useless in a spaceship traveling at the speed of light?

A thought question is a valid question. Einstein's thought questions involved thinking about what would happen if you were traveling at the speed of light. Now to answer the question: According to relativity the speed of light is absolute, so regardless of your speed you would perceive and measure the speed of light to be the speed of light. This is also true regardless of the reference frame crom the ship the light is traveling the speed of light.