It shall be unlawful to operate any vehicle which is so loaded or in a condition that the operator does not have a clear vision of all parts of the roadway essential to the safe operation of the vehicle. Any vehicle that is so constructed or loaded that the driver’s view of the roadway to the rear is obstructed shall be equipped with a mirror so attached as to give him or her a view of the roadway behind him or her.
(1980 Code, § 20.401) Penalty, see § 70.99