Vehicle-mounted device, traffic-information acquisition method, traffic-information provision system, and traffic-information provision method
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United States of America Patent
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Oct 11, 2011
Grant Date -
Jan 3, 2008
app pub date -
Jun 19, 2007
filing date -
Jun 30, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
When a change occurs between a previous traffic condition based on traffic information provided previously and the current traffic condition, a control unit of a vehicle-mounted device performs control such that traffic information is acquired from an external device via wireless communication. A comparison of current vehicle traveling conditions and previous vehicle traveling conditions can also be used to determine whether traffic information should be updated.
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