There are several ways that police can track a stolen vehicle:
License plate recognition: Police can use cameras equipped with license plate recognition technology to scan the license plates of passing vehicles and compare them to a database of stolen vehicles. If there is a match, the police can be alerted and can track the vehicle's movements.
GPS tracking: Some vehicles have GPS tracking systems installed, which can be used to locate the vehicle if it is stolen. The police can access the GPS data and use it to track the vehicle's movements.
OnStar: OnStar is a subscription-based service that provides a variety of safety and security features for vehicles, including the ability to track the vehicle if it is stolen. If a vehicle equipped with OnStar is stolen, the owner can alert OnStar, and the company can work with the police to track the vehicle's movements and locate it.
LoJack: LoJack is a stolen vehicle recovery system that uses radio frequency technology to help the police locate stolen vehicles. If a vehicle equipped with LoJack is stolen, the owner can alert the company, and the police can use the LoJack system to track the vehicle's movements and locate it.
By using these and other tracking technologies, police can often locate and recover stolen vehicles.