| dc.description.abstract | For a long time, National Freeway No. 1 is the traffic artery of the Western Corridor. Therefore, during the peak hours, the traffic entering and leaving the mainline of the freeway increased, while the off-ramp in the metropolitan area caused congestion. When the traffic flows spillback to the freeway mainline, it not only affects the speed of the traffic, but also has safety concerns for the main traffic. Congestion on off-ramp often propagates the traffic queue to the freeway mainline and occupy the shoulder lane. Therefore, this study proposes an adaptive signal control to improve the problem of off-ramp spillback to the mainline.
This study uses Linkou B north off-ramp of National Freeway No. 1 as the research object, using shock wave theory to establish a spillback model that meets this off-ramp, and find out the location of the vehicle detector by actuated control and analysis the results of extending different the green time. According to the results, the vehicle detector can be set up to 210 meters upstream of the stop line, and the nearest distance is 100 meters, of which set up to 210 meters, extend the green time for 35 seconds, and the minimum value of the total extend green time at off-ramp is 525 seconds. In order to reduce the impact on the traffic flow in other directions, can be selected to 150 meters, and the green time of the total extend green time at off-ramp is 540 seconds.
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