A Microscopic Simulation for the Arterial Signal Coordination
|關鍵字:||行為門檻模式;混合車流;連鎖號誌;微觀模擬;Behavioral Threshold Model;mixed traffic;signal progression;microscopic simulation,|
Traffic congestion has long term been one of the major control problems during rush hours in many cities of Taiwan. Field investigation has shown that the variability of driving behaviors of autos and motorcycles along roadways may increase disturbance and instability in traffic flow. Unfortunately, most of the literature focused only on the operations of auto traffic. The traffic conditions and control environment concerned are quite different from those in most areas in Taiwan. Thus, coordinating the existing traffic studies with the native research on mixed traffic flow may help realistically reflect and capture more details of the traffic world in Taiwan. With the inspiration from paper review, this study classifies the overall traffic behaviors along an urban arterial to three, i.e., intersection flow behaviors, inter-node link flow behaviors, and approach flow behaviors. Driving behaviors are modeled by referring to the behavioral threshold model and the two-dimensional coordinates model. Coordinated signal timing plans including cycle length, offset and phasing splits are designed using the exhausted searching algorithm in order to obtain the best performance value. To verify the accuracy of model development and the effectiveness of signal control, the characteristics of mixed traffic flow, such as approaching speeds, desired speeds, traffic composition, lane distribution, and turning ratio on a two-node one-way arterial in Taichung City were investigated and statistically analyzed. Initial signal cycle lengths were estimated by using the Webster's formula based on a variety of entering volumes and mixed flow ratios. System performance is evaluated by concurrently considering the indices of system delay minimization and throughput maximization. The simulation results showed that the vehicle progression rate and system performance may be increased when an exclusive stopping area for motorcycles is installed. The phasing split design is found to be a key factor that may affecting the system control performance. When at high entering volume, stop delay time may be reduced with increased cycle lengths and phasing splits, and decreased offsets. When at low entering volume, a combination of shorter cycles with longer offsets may lead to a better system performance. Also, as the proportion of motorcycles is high, a short cycle may have a higher advantage in increasing throughput and decreasing delays.