Explosions and fires have occurred when cylinders of LP Gas (propane) or acetylene have been carried or left in closed vehicles, such as vans or cars.

LP Gas is widely used by trades as a fuel for portable heating equipment, as well as by the public for barbecues and for camping. It is heavier than air, so it will accumulate in low areas rather than dissipate. It can generate an explosive mixture with air if the cylinder or attached equipment leaks.

Spark sources in the vehicle’s electrical components such as remote locking systems, electric motors (starter, wipers, aerial), ignition systems, radios and sound systems, cigarette lighters, and possibly light switches can ignite a flammable gas mixture. Lighting a cigarette in the vehicle will also ignite such a mixture