ROAD INFORMATION PROCESSING DEVICE AND METHOD, SOFTWARE FOR ROAD INFORMATION PROCESSING, NAVIGATION SYSTEM AND METHOD, AND PREPARATION METHOD FOR ROAD INFORMATION DATABASE

摘要

PROBLEM TO BE SOLVED: To acquire high precision information about concrete road conditions over a wide range in real-time and low-cost fashion. SOLUTION: A side distance detecting part 101 measures a side distance to an object beside a one's own vehicle passing through a road. A vehicle position detecting part 102 detects a current position of the own vehicle. A road information recording part 103 stores road information on the road at least including a road width at every place. A road information generating part 31 acquires new road information including an environmental form at every place of the road, according to a width of the own vehicle stored in advance, the measured side distance and the detected current position. An updating part 32 updates the road information recorded in the road information recording part 103, according to the acquired new road information.