| 摘要 |
A communication apparatus of a first vehicle receives information conveyed by modulated light emitted by a signal lamp of a traffic light apparatus or by the tail lamp of a preceding vehicle, and can relay the information to a second (following) vehicle, by modulated light emitted from a tail lamp of the first vehicle. If the first vehicle is concurrently receiving modulated light from both a signal lamp of a traffic light apparatus and a tail lamp of a preceding vehicle, only the information transmitted from the signal lamp is relayed to the second vehicle.
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