There shall not be included in any cargo of explosives any flammable liquids, acids, or corrosive liquids, oxidizers, or combustible materials, other than the explosives themselves, which may have such characteristics. Blasting caps or detonators shall not be transported upon the same vehicle with other explosives, nor shall electric blasting caps be transported upon any vehicle equipped with a radio transmitter. The foregoing provisions of this section shall be subject to such exceptions as are permitted by the United States Department of Transportation loading chart for cargoes of explosives.