| 摘要 |
PROBLEM TO BE SOLVED: To determine the time required for passing through a specified course accurately at the time of course calculation. SOLUTION: A learning table A is formed in an RAM while being sectioned into 'general period' and 'congested period', 'weekday' and 'holiday', and 'rush time', 'day' and 'night' for each type of road. At the time of traveling, a passing speed/hour is acquired for one road link being passed and the average speed/hour for same conditions is updated at any time in the learning table A. When a time required for passing through a specified course accurately at the time of course calculation, average speed/hour of a road link constituting a specified course is read out from the learning table A depending on the conditions at that moment of time and utilized. Road situation related to traffic jam is reflected on the calculation of required time, and the required time can be calculated more accurately. |
