(a) Vehicles containing explosive material shall be —   (1) Maintained in good condition and shall comply with the requirements of subpart M of this part;   (2) Equipped with sides and enclosures higher than the explosive material being transported or have the explosive material secured to a nonconductive pallet;   (3) Equipped with a cargo space that shall contain the explosive material (passenger areas shall not be considered cargo space);   (4) Equipped with at least two multipurpose dry-chemical fire extinguishers or one such extinguisher and an automatic fire suppression system;   (5) Posted with warning signs that indicate the contents and are visible from each approach;   (6) Occupied only by persons necessary for handling the explosive material;   (7) Attended or the cargo compartment locked, except when parked at the blast site and loading is in progress; and   (8) Secured while parked by having —   (i) The brakes set;   (ii) The wheels chocked if movement could occur; and   (iii) The engine shut off unless powering a device being used in the loading operation.

(b) Vehicles containing explosives shall have —   (1) No sparking material exposed in the cargo space; and   (2) Only properly secured nonsparking equipment in the cargo space with the explosives.

(c) Vehicles used for dispensing bulk explosive material shall —   (1) Have no zinc or copper exposed in the cargo space; and   (2) Provide any enclosed screw-type conveyors with protection against internal pressure and frictional heat.