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Conventional methods of intergreen time design are based on deterministic traffic flow theory and are difficult to fully reflect traffic randomness especially driver's decision differences. This study is to develop a probabilistic model to extensively investigate the effects of traffic flow randomness and driver's decision errors on the determination of intergreen times. An analytical framework was...
Mixed traffic is often mistakenly considered as the cause of poor traffic safety and low efficiency. Traditionally, traffic management department would extend the signal cycle length to decrease the start loss caused by frequent starts, and to satisfy the traffic demand of motor vehicles, without considering the demand of pedestrian and non-motorized vehicles. Simultaneously, calculation methods of...
The conventional point-detector based method for travel time estimation does not consider the impact of future downstream traffic conditions and may deviate significantly from real travel times during congestion. Though many newly arising algorithms have been developed, it is difficult for them to be applied in real situation. This paper proposes a novel and easy-to-implement method of travel time...
This paper applies the principle of vehicle dynamics and traffic conflict theory to analyze the driver behaviors and speed of next two vehicles with green lights. Based on the analysis, we propose the smallest calculation formula of green change interval which ensure vehicles cross intersection safely. Combining with traffic psychology, we study the impact of signal countdown device to green change...
Traffic microsimulation is a widely used tool in the field of computer-aided traffic engineering. In procedure of building traffic microsimulation model, the step of model calibration is difficult. Although several factors of calibration has been discussed by scholars, the calibration step has been handled by means of the experience of individual traffic engineer up to now. This unsystemic approach...
This paper presents a dynamic programming formulation and sensitivity analysis for determining the optimal sensor locations to provide expressway travel times. Such influencing factors are our concern, independence on travel time errors for individual links; percentage of probe vehicles, travel time estimation methods. Numerical example is provided in this paper to illustrate the model and algorithm...
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