Division 1.1 or 1.2 explosives must not be transported in a combination vehicle if the vehicle includes what?

Division 1.1 or 1.2 explosives, which are considered particularly hazardous due to their potential for mass detonation or strong reaction, must be transported with strict adherence to safety regulations. Among those regulations is the restriction that prohibits transporting these explosives in combination vehicles if the vehicle includes a placarded cargo tank.

A placarded cargo tank indicates that it contains hazardous materials, and transporting explosives in the same vehicle poses significant risks. The presence of explosives along with a cargo tank could lead to a catastrophic incident if an accident occurs, potentially resulting in explosions that could be triggered by the other hazardous materials. Thus, the regulation aims to minimize these risks by preventing the transport of explosives in vehicles equipped with placarded cargo tanks.

The other options do not present the same level of risk associated with transporting explosives. A standard gasoline tank, a trailer with non-flammable items, and a cab with a sleeper compartment do not carry the same inherent dangers when paired with Division 1.1 or 1.2 explosives, hence they do not invoke the same regulatory restrictions.