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