What does the driver of a tank carrying flammable liquid risk if the cargo is exposed to fire, and what is this hazard called?

A BLEVE — boiling-liquid expanding-vapor explosion — occurs when fire or intense heat raises the temperature and pressure inside a tank of flammable or pressurized liquid until the tank fails catastrophically, releasing a large cloud of vapor that ignites in a powerful fireball. It is one of the most dangerous tank emergencies. If a tanker is involved in or near a fire, the driver should keep people far away, notify emergency responders of the cargo, and never assume a relief valve will prevent a rupture. Knowing the cargo and carrying the correct shipping papers and emergency information helps responders manage the scene safely.