Patent Number: 6,338,021

Title: Route selection method and system

Abstract: In a route selection process, an optimal route searcher 5 refers to a traffic light flag included in route selecting data stored in a second storage 4 to see whether a target intersection has any traffic light or not. When the optimal route searcher 5 determines that the target intersection has a traffic light s, a traffic light cost calculator 6 calculates a traffic light cost relevant to a waiting time due to the traffic light s. Based on the traffic light cost thus calculated by the traffic light cost calculator 6, the optimal route searcher 5 calculates a passage cost relevant to a time taken for passing the target intersection. In this manner, with consideration for the waiting time due to the traffic light, a time for going through an entire route can be estimated with higher correctness, thereby rendering the route thus searched more optimal.

Inventors: Yagyu; Takeshi (Osaka, JP), Fushimi; Makoto (Hirakata, JP), Ueyama; Yoshiki (Sakai, JP)

Assignee: Matsushita Electric Industrial Co., Ltd.

International Classification: G01C 21/34 (20060101); H04B 007/185 (); G01S 005/02 ()

Expiration Date: 01/08/2019