No person shall remove any vehicle involved in an accident in which another person is killed or injured from the position in which it came to rest, until such removal has been authorised by a traffic officer, except when such accident causes complete obstruction of the roadway of a public road, in which event the vehicle involved may,
without such authority and after its position has been clearly marked on the surface of the roadway by the person moving it, be moved sufficiently to allow the passage of traffic.
