Abstract: A safety shutdown system for a vehicle containing a hazardous fluid material such as gasoline, liquid propane gas (LPG) or anhydrous ammonia (NH.sub.3) permits turn-off of the vehicle's engine and closure of the vehicle's storage tank valves by the vehicle's operator remotely located from the vehicle. The system includes a hand-held controller including a receiver and transmitter as well as a receiver/transmitter combination located in the vehicle's cab. The transmitter in the cab is coupled to a vehicle-mounted flow meter for providing an RF signal to the remote receiver for display on the hand-held controller of the amount of material discharged from the vehicle's tank. The cab-mounted receiver is responsive to an operator-initiated shutdown signal emitted by the remote controller and is coupled to a pulling solenoid which is, in turn, coupled to the storage tank valves via a cable for closing the valves and stopping the flow of hazardous material when the controller is actuated.