Traffic Signal Coordinated Optimal Control And Assessment In Urban Arterial

With the rapid development of the economic, the conflict between traffic demand and traffic supply has intensified gradually, and the traffic congestion is becoming increasingly serious. Improving the urban road traffic conditions has become essential. Intelligent Transportation System(ITS) is in the forefront of traffic science and technology in today’s world. It represents the development direction of21st century transportation system. The development of ITS is of great significance to improve the service quality of urban roads and ease traffic congestion. For ITS transportation information service system is adapt to the needs of urban development of intelligent transportation system. Urban arterial is the core of urban traffic network, and it is important for the city of rapid development of social economy. Taking it as the study object, this paper conductes the study to solve the traffic problems in urban arterial and studies from three aspects which conclude the signal control, traffic condition evaluation and system development.First of all, considering the influence of flow from minor road and the discrete property of the fleet, this paper proposes a model of minimize total delay of vehicles on urban arterial and a method which conbines the chaos optimization algorithm and a small step-way search algorithim to synthetically optimize the offset, split and cycle. The designed of simulation case for four intersections shows that this model compared whih MAXBAND method has improved20.09%on the total delay when the proportion of vehicles from minor road is between50%and70%.Secondly, this paper uses the occupancy to assess the traffic condition. This part studies from three aspects. First, this paper uses the matching method on the velocity diagram and occupancy data diagram to determine the best detection position of the detectior. The detector should be installed at the upstream50m far away from the stop line on the Tanan Road by designing a simulation case. Second, the combination of occupancy and travel time to evaluate the quality of service on signalized arterial is proposed. Third, this paper proposes the concept of the cycle-occupancy diagram(COD). A method to adjust the offset is used to analyze two intersections on Tanan Road and the optimal offset is obtained. After adjusting the offset, the travel time between the two intersections reduces0.57min.Finally, this paper roughly explores the system framework, structure and basic function of the Arterial Signal Control Information System(ACIS).