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Method and system for mapping traffic congestion
申请公布号：US2002082767(A1)
申请号：US20010998061
申请日期：2001.11.30
申请公布日期：2002.06.27
发明人：MINTZ JOSEF
分类号：G08G1/01;(IPC1-7):G06G7/76
主分类号：G08G1/01
摘要：This invention provides a system and method for mapping parameters of a queue of a traffic congestion, for example, a road congestion. Mapping of the road congestion may include determination of an average length of the road congestion over a time interval, motion rate in the road congestion and average arrival rate to the road congestion. These parameters, in turn, may be used to determine an expected delay in traveling throughout the road congestion as well as trends, i.e., changes with time, in the road congestion, using special radio systems and also existing radio networks such as Public Land Mobile Networks (PLMN) and Private/Public Data Networks (PDN). Examples of PLMN are GSM, IS-54, IS-136, PCS-1900, IS-95, GPRS and EDGE for GSM, WCDMA, cdma 2000, and others. Examples of PDN are Mobitex, CDPD and others. Other networks could be included under these categories since the mapping of road congestion usually consider only very low velocities, and hence PHS, DECT and other similar networks could also be used. The mapping is performed relative to an identified or estimated front end of a queue of a road congestion. The mapping system may construct snapshots of mapping samples received from a small percentage of pre-designated probes, e.g., a small percentage of vehicles equipped with an appropriate receiver and transmitter. The mapping samples are preferably received in response to predefined broadcast control messages sent from the mapping system. The determination of the average length of a road congestion may be based on a direct approach, obviating the need to estimate discrete lengths of the road congestion, in dynamic conditions that include variations in the arrival rate of vehicles to the road congestion and the departure rate of vehicles from the congestion over time.