Evaluation of Traffic Management Strategies for Hsuehshan Tunnel Based on ETC Open Data Analysis

• Main Authors: TSAI, CHENG-YEN, 蔡政諺
• Other Authors: CHENG, WANG-JIUNN
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/7x8c3r

碩士 === 實踐大學 === 資訊科技與管理學系碩士班 === 105 === Traffic is congested if the flow of vehicles is over the road capacity. Since long tunnels usually become bottlenecks between two regions, expected recurring congestions are inevitable during traffic peak time. Taiwan's Hsueh Shan tunnel is a typical recurring congestion case during long weekend. In order to mitigate the traffic jam, many traffic management controls, such as "Discrimination of Pricing on Peak and Off-peak Periods" and "Bus on Shoulder," were tried without improving the tunnel congestion. In this paper, the ETC open data of the tunnel will be used to analyze the correlation between traffic congestion and driving behavior. Because lane changes are prohibited in the tunnel, once a driver slows down, will seriously reduce the speed and spacing of the rear followers, this causes the stop-and-go traffic flows in the tunnel. But also due to the driving speed and following distance directly related to driving habits, how to overcome the driving in the tunnel to maintain normal driving speed and reasonable following distance become the key problem to mitigate the tunnel traffic congestion. Further analysis revealed that the speed of the high-occupancy vehicle lane control period was much higher than the speed of ramp metering control period, with an average speed of 80 to 35, but both traffic throughputs were almost the same. Therefore, it can be deduced that the probability of skilled drivers selected for each high-occupancy vehicles is higher than that of drivers during the ramp metering control period. In this paper, in order to improve the total traffic volume , flow rate and the cost time in the tunnel, we propose a new traffic control scheme by using the differential lane speed control, that is, one higher speed reservation lane for high-occupancy vehicle and the other much lower speed lane for ramp metering control. With the approach, not only we can collect the skilled drivers to use the reservation lane to maintain a higher speed with a shorter following distance, but also without affecting the unskilled drivers to use the other traditional ramp-controlled lane. Under the same traffic volume condition, the reserved vehicles and buses can pass the tunnel within 17.4 minutes and the overall average per person can shorten the journey about 22 minutes, to solve the congestion problem.