Vehicles in a funeral or other authorized procession shall proceed in single file as near to the right-hand edge of the roadway as practicable and shall follow not more than thirty (30) feet behind the next preceding vehicle in this procession at a speed not to exceed thirty (30) miles an hour but within the speed limit whichever speed is lesser. When accompanied by an adequate police escort or authorized escort service operated in compliance with this Chapter, motor vehicles in an authorized procession may proceed past red lights, stop signs or other control devices as necessary to maintain proper procession continuity. If no authorized escort is present, vehicles may not proceed as a procession but must obey all traffic regulations and control devices.