| Summary: | 碩士 === 國立交通大學 === 運輸科技與管理學系 === 100 === Recurrent congestions would occur at some interchanges which intersect with busy arterials in urban at peak hours. One of such congestions is off ramp queues spillback onto freeway main-lane. The cause of this phenomenon is, if off ramp queues could not be discharged instantly when the demand for off ramp and arterial increase at the same time, the off ramp queues would become longer. While the storage of deceleration lanes is not sufficient for the off ramp queues, these queues would spillback onto freeway main-lane and occupy the most outside lane. Such phenomenon would slow down the speed of through traffic and decrease total throughputs on main-lane. This research uses Chupei Interchange located on 91 km of Freeway No.1 as case to analyze the effect on main-lane traffic when the fore mentioned congestion occurs. Due to the insufficient real data for our research, a simulation method would be applied in this research. We would first calibrate the parameters in simulation model, then using GEH as an index to test if simulation outputs coincide with real data. After the test results are accepted, the simulation model becomes usable. The simulation outputs would be plotted into many charts to analyze the effect on main-lane traffic under different lengths of off ramp queues. An model is also constructed to compute the delay time of main-lane traffic.
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