| dc.description.abstract | Due to the geographical obstructions in Taiwan, the East-West Expressway traffic systems and the tunnels which pass through the mountain areas are built continually. The tunnel projects can be found in National Expressway No.5. , Taipei-Ilan Expressway and Northern National Highway No.2. In all of the tunnel projects, the Hsuehshan Tunnel can be the most representative one. The tunnel is a kind of half-closed space which is different from the general opened route. In these constructions, the aerator, lighting and monitor systems are needed and the geometric design of the route and the traffic service are more special than other routes. One of the most important concerns of long road tunnels is traffic safety. However, the elements that may affect the traffic safety are not only the conflagration and the spillover of hazardous goods are critical for the tunnel safety but also accidents, car breakdown, route maintenance and even traffic congestion. In general, cause the vehicle in the tunnel expose to measure an excrescent increment, all will raise car’s risk, so must take into an appropriate management control to safeguard the car’s security in the tunnel.
This research mainly focuses on the traffic flow in Hsuehshan Tunnel and has an analysis on it. To discuss the effects of different controlling strategies under tunnel safety and traffic efficiency. The project is expected to provide the managers suggestions through various performance evaluations. To design the strategies, this research takes efficiency and safety as approaches. The traffic flow control and the average speed limitation are the controlling target. The strategies are evaluated by traveling time, delay of entrancing and the effect of Queue. Through the systematic evaluation, the research shows that with the control of decreasing the entrance traffic flow or increase the average speed, the delay, waiting time in front of the entrance, the time of passing the tunnel, Queue’s length and disappearing of Queue’s length all increase immediately, but the time of passing the tunnel is shorter. | en_US |