No person shall open the door of a motor vehicle on the side nearest to moving traffic unless it is reasonably safe to do so and can be done without interfering with the movement of traffic, nor may any person leave a door open on the side of a vehicle nearest to moving traffic for a period of time longer than necessary to load or unload passengers. (Added 1971, No. 258 (Adj. Sess.), § 3, eff. March 1, 1973.)