199. In the case of a motor vehicle or a combination of road vehicles on which the only superstructure is the driver’s cab, the three red identification lights and the two red reflectors must be placed horizontally at the rear of the platform or between the two tail-lights required for all vehicles, but the red clearance lights are not prescribed in such a case as long as the tail-lights are placed not more than 150 mm from the right and left extremities of the vehicle.