According to our current understanding of physics, it is not possible for an object with mass to travel at the speed of light. As an object with mass approaches the speed of light, its relativistic mass increases, requiring an infinite amount of energy to reach or exceed that speed. Therefore, for an object with mass, such as a vehicle, it is impossible to reach or exceed the speed of light.
However, let's consider a hypothetical scenario where you are traveling at a speed very close to the speed of light, but not actually reaching it. In that case, if you were to turn on the headlights of your vehicle, the light emitted by the headlights would still travel away from the vehicle at the speed of light relative to you.
From your perspective inside the vehicle, the light would appear to behave as it normally does, moving away from you at the speed of light. However, an observer outside the vehicle, who is at rest relative to you, would measure the speed of light emitted by the headlights as still moving away from the vehicle at the speed of light relative to them.
This is a consequence of one of the fundamental principles of special relativity, which states that the speed of light in a vacuum is always constant and is the same for all observers, regardless of their relative motion.
So, in short, if you were hypothetically traveling at a speed very close to the speed of light, the light emitted by the headlights would still move away from you at the speed of light, both from your perspective and from the perspective of observers outside the vehicle.