| Summary: | 碩士 === 國立交通大學 === 資訊科學與工程研究所 === 101 === Providing real-time traffic information, such as traffic speed and travel time, to road users can save traveling time and reduce fuel consumption. With the increasing popularity of smartphones, which are embedded with a variety of sensors and capable of wireless data communication, smartphones on moving vehicles can be used as probes to collect real-time traffic information. Conventional probe vehicles send their traveling data including speed and location to a traffic information center (TIC) periodically. However, as the number of probes increases, there may be redundant reports sent to the TIC. In this thesis, we present a traffic report system and method to monitor the dynamic changes of traffic jams on highway. The TIC maintains the start location, end location and travel time of each traffic jam, and broadcasts the information to the probes, as well as the general road users. As the probes travel on the highway, they compare the broadcast traffic jams with their traveling data. If there are significant changes of the start location, end location or travel time are detected, the probes report the changes to the TIC. Based on the reports, the TIC updates the status of traffic jams and broadcasts the new traffic jam information. To evaluate the performance of our system, we have performed simulations using traffic model simulator VISSIM. The simulation results indicate that our approach can effective monitor the dynamic changes of traffic jams on highway and provides advance warning of traffic jams to over 85% of road users with location errors under 100 m. In addition, the report policy we proposed reduces over 50% of the communication between the probes and the TIC.
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