Abstract: The present invention provides a system and method for authorizing a user of a tractor-trailer to drive the tractor-trailer out of a plurality of tractors and trailers. The system comprises modules such as tractor modules and trailer modules. Each module comprises a user interface and a transceiver. A tractor module is located in each of the tractors and is uniquely associated with that tractor. The tractor module is also operatively associated with systems of that tractor. A trailer module is located in each of the trailers and is uniquely associated with that trailer. The trailer module is also operatively associated with systems of the trailer. In the system, a unique code is associated with each user and a central station sends this unique code to the modules, so that the modules enable the user to drive the tractor with the trailer.

Abstract: An anti-theft system comprises a digital code in a key ring. The code is transmitted to a client box installed in a car. The box analyses the code and, in the case of theft, transmits a distress signal to a surveillance station. The surveillance station is equipped with a receiver and a display to display information concerning the stolen vehicle. A person at the surveillance station can stop the stolen vehicle or can use a switch on the surveillance station unit that sends a signal to a receiver in the client box and thus turns off the fuel pump of the car.

Abstract: An anti-theft system comprises a digital code in a key ring. The code is transmitted to a client box installed in a car. The box analyses the code and, in the case of theft, transmits a distress signal to a surveillance station. The surveillance station is equipped with a receiver and a display to display information concerning the stolen vehicle. A person at the surveillance station can stop the stolen vehicle or can use a switch on the surveillance station unit that sends a signal to a receiver in the client box and thus turns off the fuel pump of the car.