| 摘要 |
System and method for mapping parameters of traffic congestion, for example, a road congestion, relative to a focus is disclosed. 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 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. The mapping is performed relative to the mapping focus, typically the front end of a road congestion. The mapping system may construct snapshots of mapping samples received from a small percentage of predestinated 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 queries 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 may include variations in the arrival rate of vehicles to the road congestion and the departure rate of vehicles from the congestion over time.
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