摘要(英) |
The 12.9 km long Hsuehshan Tunnel sits on Taiwan’s National Highway No. 5. It is a two-bore (two lines working) tunnel and is the fifth longest highway tunnel in the world. Throughout the tunnel, monitoring devices are deployed to collect traffic data, control traffic flows, detect unexpected events, and identify the characteristics of traffic flows, which is under-explored in long tunnels.
This study collects the video recordings on individual vehicles in order to find out the characteristics of traffic flow. Such information will provide deepen insight into the speed change of each vehicle. Because of the inconvenient access to the facilities of the video recordings, the speed change of the individual vehicle in the tunnel is analyzed by non-continuous observations. The aim of this study is to explore the characteristics of free-flowing vehicles from both micro- and macro-perspectives, while trying to identify the average of speed change when drivers are driving in long tunnels. By doing so, the sections where the largest speed change occurs are pinpointed and compared to the average speed of both the north-bound and the south-bound lines. Next, the average speed of free-flowing vehicles in both the north-bound and south-bound lines, are equipped with identical devices, and we will discuss the effect of grade on the speed.
The results show that (1) whether it’s in the north-bound or south-bound line, the average speed of free-flowing vehicles tends to decrease in the mid sections; (2) the average speed of the inner lane is considerably higher than that of the outer lane; (3) there is no significant difference between the average speeds of large and small vehicles; and (4) the average speed of free-flowing vehicles is not affected by the grade inside the tunnel. |
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