| Summary |
Hsieh-Jung Cho, 2008.06
Department of Transportation Technology and Management National Chiao Tung University
Hsin Chu Science Park has become the scientific and technological center in recent years. More traffic demand occurs due to the expansion of the facility, and leads to saturated road capacity and congestion. One alternative to improve the situation is to build new roads, but it may influence configuration of the existing buildings in the park. The other alternative, better and cheaper, is to design signal system efficiently.
Network planners purpose to minimize the system cost, but we suppose that users adapt to the War drop’s first principle: the road users will minimize his own travel cost. The conflict between UE and SO makes the total travel cost higher. We describe this problem as a bilevelmodel. The upper is network planner whose objective function is to minimize total system cost. The lower is road users which stand to UE. It is a condition in this model. To solve thebilevel problem, we need to know the reactions between the roads users. It means that we need to calculate the sensitivity information to solve the bi-level network problem.
We collect the attributes of the roads in the research range, such as road length, roadside interference, lane number, and etc., to derive the link performance function and calculate the coefficients in this study. Then formulate the network bi-level problem, and solved by the Gradient Steepest Descent Algorithm. Finally, we compare the result with the current signal. |
