A. The owner or operator of a vehicle transporting flammable liquids shall not, except where he is protected by a flagman then on duty, cross any railroad without coming to a full stop, before reaching it, in such manner and for such time as to make certain that no train or other facility is approaching, as provided in R.S. 32:173. If the vehicle is transporting explosives, the operator shall proceed across the tracks only under the protection of a competent flagman furnished by the owner or himself. Under no circumstances whatever shall any vehicle transporting explosives carry as part of its load any other commodity or thing.
B. The commissioner is authorized to adopt regulations concerning the markings and identification of vehicles transporting explosives and flammable liquids.