Bus manufacturing is a specific sector of the automotive industry, which carries out the manufacturing of buses and coaches. Bus manufacturing had its earliest origins in carriage building. Other bus manufacturers had their origins in truck manufacturing. Bus bodywork is usually geared to short trips, with many transit bus features. Coach bodywork is for longer distance trips, with luggage racks and under-floor lockers. Bus manufacture underwent major change with the push toward low-floor designs, for improved accessibility. Some smaller designs achieved this by moving the door behind the front wheels.