Research On Signal Intersection Channeling Area Variable Lane Design Theorem

In recent years, With the rapid development of the national economy and the process of urbanization is accelerating,The total number of motor vehicles rose sharply,although the density of urban road network and transport facilities have been greatly corresponding increase. It's difficult to meet the traffic demand, especially in the big cities, road facilities far outpaced the increase in the growth rate of traffic demand, phenomenon of traffic jams is gradually growing, traffic order is increasingly chaotic, Our urban transport development is faced with new challenges. To address the widespread problem of traffic congestion, Traffic engineering studies gradually shifted the focus to make full use of the existing road infrastructure, use low-cost, quick-impact traffic flow organization and traffic control means to solve traffic problems, improve the operation of the road traffic.Urban Intersection is an important component of the city road system and transport network nodes and urban traffic bottlenecks. Compared to road section, Survey of traffic in all directions and flow operate here and mutual interference, the characteristics of traffic complex, its capacity is far less than sections, this complexity of the traffic chaos into order and become to traffic accidents multiple points, to address urban traffic congestion problems, the key is to ensure the smooth flow of Urban Intersection, its channeling, timing and design are reasonable direct impact on the entire city transport network efficiency.At present, Some cities set up an intersection turn left lane may not satisfy the needs of left-turn car, left-turn car is saturated even stopping two times, Traced to the result of an accumulation of the queue to turn left into the upper reaches of the drainage, straight vehicles to go through the intersection is affected, but if it channeled two lanes ,it maybe affect the capacity of straight vehicles, so to make the capacity of the entire intersection reduce.In view of such vehicles in the left turn lane of a single drainage saturation, in order to left-turn vehicles as soon as possible go through the intersection, make full use of the limited lane of intersection, Balance the traffic jams which due to lack of lane, the uneven flow caused, and the need to transform function a timely manner and left turn lanes adjacent lane.Turn left on the current car is not simply a study of the Organization adopted from the time the vehicle left turn signal distribution to be taken into account, else take into account from space in order to Separate conflict vehicles. To supply road conditions remain unchanged and will not affect the normal operation of other traffic direction, under the premise, reasonable dynamic adjustment lane functions, need to be considered from a perspective of time and space begin and the two intersections to improve the capacity of the cars turn left method.In this paper, as a starting point, from the perspective of intersection left-turn vehicles control, from a new exploration focus on intersection traffic flow on the control and organization form, intersection traffic flow operation Characteristics, variable lane level flow control algorithm, overflow and non-overflow condition evaluation methods, and several other areas, On the urban road intersection signal Drainage District variable lane of the implementation of the programme of research theory:The first chapter introduced the study background and the necessary of variable lane control, in the base of analyzing domestic and overseas study status in quo, the paper make sure the study content and technique path.The second chapter make certain the variable lane collectivity control logic, depending on the variable lane optimize aim and principia, Variable lane is the implementation of the applicable conditions and detailed analysis of the signal in the different stages of the cycle lanes of traffic variable characteristics of the operation, it provide a theoretical foundation for follow-up research.The third chapter analyzed advantages and disadvantages of Timing control and real-time control, Qualitative Studied the overflow initial conditions and different time slots under the variable method of determining lane critical condition, in allusion to the role of variable lane Under different traffic state, study the Low flow and high flow control logic of variable lane, establish control algorithms and parameters Method.The forth chapter selected Intersection delays and the capacity as evaluation index under the principia of evaluation index, analyzed Overflow of state and non-state overflow on the impact of intersection delays and traffic capacity, established two of different evaluation methods under the control states, and examples of validation and analysis through variable lane implementation of the program before and after the effect of control. The fifth chapter summarize the full text, and made a number of inadequacies in, as well as a vision for the future.The second to forth chapters are the main parts of this paper, The second chapter is the theoretical basis of the third and the forth chapters, Third, the last four chapters are the core content of this paper, presented in the low-flow and high-flow control algorithm both on the basis of ideas, overflow is a further state of both state and non-state counterparts overflow traffic evaluation, for road managers formulate scientific and rational variable lane intersection control program and provide a theoretical basis. This paper studies the intersection turn left to ease traffic congestion implementation of the strategy provided a strong theoretical guidance and reference. For raising the city's toll road intersection signal capacity and reduce delays to a certain extent practical significance.