"Small quantities of explosive materials occasionally have to be transported from a central storage or manufacturing facility to a construction site where they will be used. In those cases, portable or mobile magazines must be used to meet over-the-road safety requirements of National Fire Protection Association 495, 'Explosive Materials Code' and the U.S. Department of Transportation, 49 Code of Federal Regulations [CFR] 100--179 and 49 CFR 397."
Coffee Break Training - Fire Protection Series No. FP-2013-24
U.S. Fire Administration: http://www.usfa.dhs.gov/