Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Seiji Fuyama0
Date of Patent
April 1, 2008
0Patent Application Number
098642350
Date Filed
May 25, 2001
0Patent Citations Received
Patent Primary Examiner
Patent abstract
An ETC system for a toll road includes a road-side device. The road-side device transmitting a polling signal. The road-side device receives a response of an on-vehicle device to the transmitted polling signal. A decision is made as to whether or not the response is received a plural number of times. In cases where it is decided that the response is received a plural number of times, next radio communications with the on-vehicle device are started.
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