i think removeElements must be
destroyElement
there's no such thing as removeElements. Try replacing the removelements function with this:
destroyElement( car1gate1, vehicle, 0.4, 6.2, -0.6, 90, 90, 90 )
destroyElement( car1gate2, vehicle, 0.4, 13.2, -0.6, 90, 90, 90 )