A navigation guidance system (1) is provided which provides direction information from a remote server (11) to a mobile user unit (2) for guiding user to a desired destination. The navigation guidance system (1) maintains time-related models for traffic speeds expected on road segments of a road database. By maintaining such time-related models, the system can more accurately provide the user with road guidance instructions to arrive at a chosen destination by a given time. The system can also provide more accurate route guidance information to a destination over different routes, even during rush hour or at off peak times. These time related models can be changed as a result of changing traffic patterns or as a result of an incident on a road segment. In a preferred embodiment, therefore, the system continuously monitors each calculated route and advises the users of alternative routes or of updated departure or arrival times as appropriate.
申请公布号
WO0188480(A1)
申请公布日期
2001.11.22
申请号
WO2001GB02182
申请日期
2001.05.16
申请人
YEOMAN GROUP PLC;HANCOCK, SIMON, GEOFFREY;AGNEW, HUGH, JOHN;GEAKE, VINCENT