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When you transport propane tanks in your car, you should never carry them in the trunk. Propane tanks have a pressure relief valve that will vent propane if it overheats. When propane is released, it expands and can fill your trunk with highly flammable gas. Any spark or ignition source can ignite the gas with an explosion. Even some brake lights can ignite the gas.
To transport propane, put the bottle in the back seat, wedged between the seats. Always keep the tank upright. Open a window and keep the car cool. Never leave the tank in a car for long periods of time.