Section 57.6202 - Vehicles(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 at surface areas of underground mines, except when parked at the blast site and loading is in progress; and(8) Secured while parked by having-(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.