Generating alternative routes

摘要

A method of generating routes in an area covered by an electronic map is described. The map comprises a plurality of segments representing navigable segments in the area covered by the electronic map, each segment being associated with jam probability data representative of a likelihood of a jam on the segment. The method involves generating a first route between an origin and a destination in the area, and generating at least one alternative route between the origin and destination using the jam probability data associated with the segments in the area. In embodiments jam and non-jam travel time data is used with the jam probability for a segment to obtain a measure of reliability of the segment under given traffic conditions, which is used to generate the alternate route(s).

主权项

1. A method of generating a route in an area covered by an electronic map, the map comprising a plurality of segments representing navigable segments in the area covered by the electronic map, each segment being associated with jam probability data representative of a likelihood of a jam on the segment, the method comprising:
exploring routes between an origin and a destination in the area to determine a minimum cost route, wherein the cost of each of a plurality of segments is determined using a cost function such that the cost for a segment is based at least on a reliability measure indicative of an expected reliability of the segment under a theoretical traffic condition, said reliability measure being obtained using the jam probability data associated with the segment, and wherein the theoretical traffic condition is selected from a plurality of predefined traffic severity levels; and outputting said determined minimum cost route as the route between the origin and the destination.