TRAFFIC INCIDENT DETECTION SYSTEM
First Claim
1. A traffic information system that detects the presence or absence of an unexpected incident on a road link based on externally provided traffic information, comprising:
- a traffic information storage unit that accumulates the traffic information;
a statistical computation unit that generates correlation information among road links about traffic information by statistical analysis for historical traffic information stored in the traffic information storage unit;
a traffic information reconstruction unit that determines traffic information reconstructed using the correlation information so that an error relative to input traffic information is minimized;
a difference computation unit that determines a difference between the traffic information input to the traffic information reconstruction unit and the reconstructed traffic information reconstructed for the input traffic information by the traffic information reconstruction unit; and
an unexpected incident determination unit that determines the presence or absence of an unexpected incident, whereinthe traffic information reconstruction unit determines real-time reconstructed traffic information reconstructed for currently provided traffic information, and historical reconstructed traffic information reconstructed for the historical traffic information stored in the traffic information storage unit,the difference computation unit determines a first difference that is a difference for each road link between the currently provided traffic information and the real-time reconstructed traffic information, and a second difference that is a difference for each road link between the historical traffic information stored in the traffic information storage unit and the historical reconstructed traffic information,the unexpected incident determination unit determines the presence or absence of an unexpected incident for each road link by comparing the first difference with a threshold defined based on the second difference, anddetermined unexpected incident information is distributed to an on-board terminal.
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Abstract
An object of the present invention is to provide a traffic information system that detects an unexpected incident such as a traffic accident or construction work from traffic information about surrounding road links. Historical traffic information is used to perform component analysis for a group of links that are targets of unexpected incident detection, and recovered traffic information for the historical traffic information is determined from computed top bases of the traffic information about the group of links. Difference statistical traffic information is generated from the difference between the historical traffic information and its recovered traffic information. For real-time traffic information, recovered traffic information for the real-time traffic information is determined from the top bases. The difference between the real-time traffic information and the recovered traffic information is compared with the difference statistical traffic information, and if the difference of the real-time traffic information is larger, the occurrence of an unexpected incident is determined.
36 Citations
7 Claims
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1. A traffic information system that detects the presence or absence of an unexpected incident on a road link based on externally provided traffic information, comprising:
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a traffic information storage unit that accumulates the traffic information; a statistical computation unit that generates correlation information among road links about traffic information by statistical analysis for historical traffic information stored in the traffic information storage unit; a traffic information reconstruction unit that determines traffic information reconstructed using the correlation information so that an error relative to input traffic information is minimized; a difference computation unit that determines a difference between the traffic information input to the traffic information reconstruction unit and the reconstructed traffic information reconstructed for the input traffic information by the traffic information reconstruction unit; and an unexpected incident determination unit that determines the presence or absence of an unexpected incident, wherein the traffic information reconstruction unit determines real-time reconstructed traffic information reconstructed for currently provided traffic information, and historical reconstructed traffic information reconstructed for the historical traffic information stored in the traffic information storage unit, the difference computation unit determines a first difference that is a difference for each road link between the currently provided traffic information and the real-time reconstructed traffic information, and a second difference that is a difference for each road link between the historical traffic information stored in the traffic information storage unit and the historical reconstructed traffic information, the unexpected incident determination unit determines the presence or absence of an unexpected incident for each road link by comparing the first difference with a threshold defined based on the second difference, and determined unexpected incident information is distributed to an on-board terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification