An automatic toll charging system and a vehicle-mounted unit used in the automatic toll charging system

摘要

An automatic toll charging system communicates by radio between roadside units 30-60 disposed on each gate of a toll road and a vehicle-mounted unit 10 mounted in a vehicle, and automatically charges a toll in a range from an entrance gate to an exit gate. In this system, an information recording medium 20 is inserted in the vehicle-mounted unit 10, and payment information recorded in the information recording medium 10 and entrance information received from a roadside unit 30 disposed at the entrance gate are recorded in the information recording part 13. In addition, the entrance information recorded in the information recording part 13 is transmitted to the roadside unit 50 disposed at the exit gate, and a toll payment process is executed. The entrance information is recorded in the information recording medium 20 as a backup so the toll payment process can be executed even if a function of the vehicle-mounted unit 10 goes wrong.