Traffic Notification System with Reduced Communications Requirements
|關鍵字:||交通通報系統;探針車;浮動車;traffic notification system;probe car;floating car data|
Providing real-time traffic information, such as traffic speed and flow, to road users can save traveling time and reduce fuel consumption. With the increasing popularity of on-board GPS devices and wireless data communication capability, it becomes feasible to obtain global real-time traffic information from GPS-equipped probe cars, which periodically report speed to a traffic information center (TIC). To provide real-time information, the report period needs to be short. This may result in a huge number of reports to an over-loaded TIC. In this thesis, we present a traffic report system and method with fast feedback to reduce the number of traffic reports from probe cars. The TIC periodically broadcasts the maximum speed collected in the previous period for each road segment. After receiving the TIC broadcast, probe cars with fast speed would report their speed to the TIC earlier than those with slow speed. The TIC will also broadcast the maximum speed of this cycle immediately after it receives a speed report. This immediate broadcast would prevent slow-moving probe cars from reporting their speeds. The same method can be used to obtain the minimum travel time as well. To evaluate the performance of the system, we have performed simulations using the traffic model simulator VISSIM. The simulation results indicate that our approach significantly reduces the number of traffic reports and the loading of the TIC. The results also suggest that it is feasible to use the maximum speed and the minimum travel time to indicate traffic conditions.
|Appears in Collections:||Thesis|
Files in This Item: