1) The document describes a smart vehicle tracking system that uses GPS, GSM, and RC5 technology to track a vehicle's location and lock the engine if theft is detected.
2) The system includes a microcontroller that is connected to a GPS module to determine the vehicle's coordinates and a GSM module to send SMS messages.
3) If an unauthorized person enters the vehicle when it is locked, the microcontroller detects a theft attempt, locks the vehicle, and sends a message with the vehicle's location to the owner.