Patent ID: 6781523
Filing Date: 2004-08-24
Classification: G07B,G08G

Abstract:
A road traffic monitoring system, which comprises:vehicle-mounted wireless ID devices that are mounted in every vehicle traveling upon a road, that store an encoded identification number containing a vehicle identification number and other ID information, and that transmit some or all of said encoded identification number upon receiving a stipulated request for response; roadside traffic monitoring devices installed at intersections where three or more entrances and exits meet or other strategic traffic monitoring areas; and roadside wireless devices that are installed at every entrance to a monitoring area at which one of said roadside traffic monitoring devices is installed, and at every exit from said monitoring area, that emit a request for response to vehicles that pass through a stipulated monitoring region, and that receive identification numbers transmitted by the vehicle-mounted wireless ID devices of traveling vehicles in response to this request for response, wherein, all roadside wireless devices transmit the identification numbers sent from the vehicle-mounted wireless ID devices of the traveling vehicles to the roadside traffic monitoring devices, and upon receiving identification numbers from the various roadside wireless devices, the roadside traffic monitoring device determines a time series for the position information of vehicles in the monitoring area, thereby identifying the movement status of each vehicle.