Vehicles used for the transportation of explosive materials shall be equipped with springs, and have a solid floor with well-maintained interior surfaces. Such vehicle shall have a sturdy wooden body with wooden sides and ends and with no exposed ferrous metal on the inside thereof where explosive materials are carried, except that portable magazines may be transported in vehicles having exposed metal parts. The body shall be completely enclosed, or shall be provided with a flame- resistant moisture-resistant tarpaulin for total covering of all explosive materials carried.