Automatic payment system for access to an urban and/or extra-urban area for motor vehicles and control device for vehicles

Automatic payment system for access to an urban and/or extra-urban area for motor vehicles, comprising a device (1) provided with at least one sensor (2) placed in each of the seats of the vehicle, a controlling unit (3) linked to the sensors for the reception of a signal informing of the presence or absence of a person sitting on the seat, and a data transmission unit (4) for sending the data captured by said sensors upon receiving an order from the external device (5), in such a way that when the vehicle enters an area, the payment facility of said area, which is adapted for communicating with the transmission unit (4) provided in the vehicle, receives a signal informing it of the number of passengers sitting inside the vehicle and subsequently the payment facility establishes a fee according to the number of passengers.