Would it be possible for a truck, measuring 5ft tall when stationary, to pass under a 4ft barrier by accelerating towards the speed of light? If so what would a spectator see if standing next to the barrier, would the spectator see the truck shrink? What would you see of the barrier from the trucks frame of reference, would the barrier seem to grow? Sorry if my question appears unclear I couldn't think of another way to explain it. Thank you in advance for reading/attempting to answer the question.