It shall be lawful for any fire department vehicle when returning to its fire station from an emergency call to display a flashing red light visible under normal atmospheric conditions from a distance of at least 500 feet to the rear of the vehicle and no driver of any vehicle other than one on official business shall follow any such vehicle displaying said light closer than 300 feet.

L.1966, c. 289, s. 1, eff. Oct. 6, 1966.