Apparatus and method for safety shut-off of a liquid gas system for vehicles and / or vehicle trailer in case of accident

Safety shut-off (19) for a liquefied gas system (10) for vehicles and / or vehicle trailer to prevent an accidental release of gas in the event of an accident of the vehicle and / or vehicle trailer, comprising a gas valve (20) to the gas supply shut-off, an electronic unit (21) for controlling the gas valve (20), and at least one sensor (22, 23), characterized in that the at least one sensor (22, 23) serves for the determination of an accident of the vehicle and / or vehicle trailer, wherein the sensor is connected to pass an accident report to the electronic unit, wherein said gas valve (20) as an electromagnetic gas valve (20) is formed, and wherein the electromagnetic gas valve (20) in the absence of electrical power supply shuts off the gas supply.