In-vehicle apparatus, roadside device, and traffic information system
First Claim
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1. An in-vehicle apparatus, comprising:
- a first receiver to receive first group identification information about a vehicle group that is transmitted from a first roadside device by a signal having directivity and to receive second group identification information from a transmitter of another vehicle;
a judging unit to identify the vehicle group to which a host vehicle of the in-vehicle apparatus belongs based on at least one of the first group and the second group identification information; and
a second transmitter to transmit identification information of the identified vehicle group rearward from the vehicle by a signal having directivity, whereinthe first receiver receives the second group identification information transmitted from the second transmitter of a vehicle ahead, andthe judging unit judges that the host vehicle thereof is a representative vehicle of a vehicle group if the first receiver receives first group identification information from the first roadside device and does not receive the second group identification information from the vehicle ahead.
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Abstract
An in-vehicle apparatus includes a first receiver capable of receiving identification information about a vehicle group that is transmitted from a first roadside device in a signal having directivity; a judging unit for identifying a vehicle group to which a host vehicle of the in-vehicle apparatus belongs based on the identification information; and a first transmitter capable of transmitting the identification information to a second roadside device connected to a network of a road traffic system.
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Citations
12 Claims
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1. An in-vehicle apparatus, comprising:
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a first receiver to receive first group identification information about a vehicle group that is transmitted from a first roadside device by a signal having directivity and to receive second group identification information from a transmitter of another vehicle; a judging unit to identify the vehicle group to which a host vehicle of the in-vehicle apparatus belongs based on at least one of the first group and the second group identification information; and a second transmitter to transmit identification information of the identified vehicle group rearward from the vehicle by a signal having directivity, wherein the first receiver receives the second group identification information transmitted from the second transmitter of a vehicle ahead, and the judging unit judges that the host vehicle thereof is a representative vehicle of a vehicle group if the first receiver receives first group identification information from the first roadside device and does not receive the second group identification information from the vehicle ahead. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 12)
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10. A traffic information system, comprising:
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a first roadside device comprising a transmitter to transmit first group identification information about a vehicle group to a vehicle in a signal having directivity; an in-vehicle apparatus comprising a receiver to receive the first group identification information from the first roadside device and to receive second group identification of a vehicle group from a transmitter of another vehicle, and a judging unit to identify a vehicle group to which a host vehicle of the in-vehicle apparatus belongs based on at least one of the first group identification information and the second group identification; and a second transmitter to transmit identification information of the identified vehicle group rearward from the vehicle by a signal having directivity, wherein the first receiver receives the second group identification information transmitted from the second transmitter of a vehicle ahead, and the judging unit judges that the host vehicle thereof is a representative vehicle of a vehicle group if the first receiver receives first group identification information from the first roadside device and does not receive the second group identification information from the vehicle ahead. - View Dependent Claims (11)
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Specification