Patent ID: 7474233

Claim:
A vehicle detection device for a multi-lane roadway with a first parking gate at a first lane and a first parking stand located before the first parking gate in the direction of travel, including a first geomagnetic field sensor for detecting the presence of a vehicle at the first parking stand, and a reading device for at least one of a storage medium and a car park ticket dispenser, which activates a first mechanism for opening the first parking gate when one of an authorization recorded on the storage medium is read, or after the issuance of a car park ticket a second parking gate at a second lane adjacent the first lane for vehicles traveling in the same direction as vehicles traveling in the first lane, a second parking stand disposed before the second parking gate, including a second geomagnetic sensor for detecting the presence of a vehicle at the second parking stand, and equipment for providing reciprocal communication between the first and second parking stands, and for comparing at least one of signal intensity and signal form of signals from the first and second geomagnetic field sensors to determine the lane in which a sensed vehicle is located.