| Summary |
Jhih-Jian Huang，2007.07
Feng Chia University
Travel time is an important information for traveler’s route choice. The better utilization of this information could improve traveler’s efficiency in time. Currently the highway systems in Taiwan is fully deployed with vehicle detectors with the intention to gather the vehicle flow information on highways. One common problem is the completeness of traffic data from those detectors, either detectors are out of service or data is missing due to unknown reasons. This problem could lead to less-than-sufficient travel time predictions.
The vehicle detector data from Highway 1, northbound from 103.8 Km to 148.2 Km, dated from July 1 to July 7, 2006 was used for analysis. This study tried to understand the relationship between data from one vehicle detector and its upstream and downstream detectors and to estimate the data from one highway location with a defective detector based on the data from its upstream and downstream detectors.
The result of study indicates that the relationship between the average speed of highway vehicle flow at one location and its adjacent upstream and downstream locations is somewhat linear and the result of using estimated average speed data in travel time predictions is satisfactory. |
