Traffic information providing system and car navigation system
First Claim
1. A traffic information providing system for creating traffic information to be used in a car navigation system, comprising:
- traffic information acquiring means externally acquiring traffic information including information relating to a travel time of each of links making up a road on a map;
storage means for storing the traffic information acquired by the traffic information acquiring means;
statistical means statistically processing past traffic information stored by the storage means; and
complementing means calculating traffic information relating to a travel time for a non-provision link to which information about a travel time is not provided by the traffic information acquiring means, through estimate/complement operation on the basis of the statistical processing of the statistical means and traffic information about links in the vicinity of the non-provision link, wherein the traffic information acquired by the traffic information acquiring means includes a congestion degree at each collection time point of the traffic information and information about a length of a section showing the congestion degree;
the complementing means has a complementing function of calculating a travel time for the non-provision link with use of the congestion degree of the non-provision link, the length of the section indicative of the congestion degree, and a travel speed corresponding to each predetermined congestion degree; and
the complementing function, when an unknown-congestion-degree section is-included in the non-provision link, has at least one of a function of treating the unknown-congestion-degree section as a normal congestion degree section, a function of treating the unknown-congestion-degree section as a section having the same congestion degree as a section having a known congestion degree in the non-provision link, and a function of treating the unknown-congestion-degree section as a section having the same congestion degree as the section having the known congestion degree having a length of each congestion degree obtained by multiplying a ratio of the known-congestion-degree section for each congestion degree by a length of the unknown-congestion-degree section.
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Accused Products
Abstract
A traffic information providing system externally acquires traffic information including information relating to the travel time of a link, calculates a travel time for a non-provision link to which no travel time is provided through estimate/complement operation. The estimate/complement operation is carried out with use of travel times, emergencies, travel times of links in the vicinity of the non-provision link, and so on, obtained in the near past. The system stores and statistically processes the externally-acquired traffic information, and also estimates a travel time in the near future. When there is an abnormality in the acquired traffic information, the system deletes the abnormality, regards the information as a non-provision link, calculates a probability distribution of travel times of links, calculates a probability distribution of travel times of the entire route made up of a plurality of links, and also calculates a probability for a specific travel time range.
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Citations
8 Claims
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1. A traffic information providing system for creating traffic information to be used in a car navigation system, comprising:
- traffic information acquiring means externally acquiring traffic information including information relating to a travel time of each of links making up a road on a map;
storage means for storing the traffic information acquired by the traffic information acquiring means;
statistical means statistically processing past traffic information stored by the storage means; and
complementing means calculating traffic information relating to a travel time for a non-provision link to which information about a travel time is not provided by the traffic information acquiring means, through estimate/complement operation on the basis of the statistical processing of the statistical means and traffic information about links in the vicinity of the non-provision link, wherein the traffic information acquired by the traffic information acquiring means includes a congestion degree at each collection time point of the traffic information and information about a length of a section showing the congestion degree;
the complementing means has a complementing function of calculating a travel time for the non-provision link with use of the congestion degree of the non-provision link, the length of the section indicative of the congestion degree, and a travel speed corresponding to each predetermined congestion degree; and
the complementing function, when an unknown-congestion-degree section is-included in the non-provision link, has at least one of a function of treating the unknown-congestion-degree section as a normal congestion degree section, a function of treating the unknown-congestion-degree section as a section having the same congestion degree as a section having a known congestion degree in the non-provision link, and a function of treating the unknown-congestion-degree section as a section having the same congestion degree as the section having the known congestion degree having a length of each congestion degree obtained by multiplying a ratio of the known-congestion-degree section for each congestion degree by a length of the unknown-congestion-degree section. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- traffic information acquiring means externally acquiring traffic information including information relating to a travel time of each of links making up a road on a map;
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8. A traffic information providing system for creating statistical traffic information for use in a car navigation system, comprising:
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traffic information acquiring means which acquires externally provided traffic information; storage means which stores the acquired the traffic information of each link making up a road on a map; and a traffic information processing unit which reads out the stored information in time zones for creating statistical traffic information for each said link including a non-provision link to which traffic information is not provided, based on the stored traffic information and estimated traffic information about the non-provision link, wherein absent traffic information about any said link in a vicinity of a specific non-provision link, the traffic information processing unit estimates traffic information about the specific non-provision link based on traffic information provided about at least one other link having a route attribute the same as that of the specific non-provision link, wherein the route attribute includes at least one of a route course, a road class and a traffic lane direction.
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Specification