Traffic information generation method, traffic information generation device, and navigation system
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United States of America Patent
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Apr 30, 2013
Grant Date -
Jun 3, 2010
app pub date -
Aug 22, 2008
filing date -
Aug 22, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A traffic information generation method for generating traffic information for each link includes a vehicle speed detection step of detecting a vehicle speed at predetermined distance intervals or at predetermined time intervals using a vehicle speed sensor; and a traffic jam degree detection step of referring to a specified speed and a specified distance prescribed in association with a traffic jam degree representing a level of a traffic jam and a connection determination distance prescribed in accordance with a road type to detect the traffic jam degree corresponding to the vehicle speed. When a link length falls within a predetermined range, information on the traffic jam degree corresponding to a fastest vehicle speed within a prescribed starting point distance from a beginning of the link is allocated to the link.
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