Patent ID: 8744735
Filing Date: 2014-06-03
Classification: G08G,G09B

Abstract:
1. A traffic information generating method for generating traffic information about a road on which a vehicle travels, the method comprising: a vehicle speed detecting step of detecting a vehicle speed of the vehicle at predetermined distance or time intervals using a vehicle speed sensor; and a congestion degree detecting step of a congestion degree detection unit detecting a congestion degree associated with the vehicle speed by referring to a prescribed speed and a prescribed distance that are predetermined in association with the congestion degree, and a link determination distance prescribed in accordance with a road type, wherein the congestion degree detecting step includes determining that the vehicle speed is lower than the prescribed speed between a first point at which the vehicle speed becomes equal to or greater than the prescribed speed to a second point that is within the link determination distance from the first point, when: a) the vehicle speed is lower than the prescribed speed at the second point, the congestion degree detecting step determining that the vehicle speed is equal to or greater than the prescribed speed between a first point at which the vehicle speed drops below the prescribed speed and a second point that is within the link determination distance from the first point when: b) the vehicle speed is equal to or greater than the prescribed speed at the second point, and wherein the congestion degree detecting step includes determining that the vehicle speed is not lower than the prescribed speed between the first point and the second point when the condition a) is satisfied, or that the vehicle speed is not equal to or greater than the prescribed speed between the first point and the second point when the condition b) is satisfied, in a case where the vehicle makes a right turn or a left turn between the first point and the second point.