Left-turn Non-motorized Traffic Flow Characteristics And Spatial Planning Methods At Intersections

Transportation is the cornerstone of urban construction,the driving force of urban development,and it plays a fundamental,global and leading role in the development of urban economy and urbanization.The intersection is the meeting point of all kinds of traffic participation behavior in urban roads,and it is also the frequent occurrence of traffic conflict and even traffic accident.Non-motorized vehicles are an important part of urban slow-moving transportation system and an important mode of transportation to improve the sustainability of transportation system.In recent years,with the increase of the number of non-motor vehicles,the same left-turning machine non-traffic flow in the intersection space mixed,easy to produce interference and conflict,resulting in the overall traffic order chaos,frequent accidents and operational efficiency decline.At present,the planning and design and management of urban intersections have been focusing on motor vehicles,lack of exploration of non-motor vehicles turning left at intersections,combined with the research results of non-motorized traffic flow characteristics landing space planning design is rare.Therefore,it is of great practical significance to study the left-turn non-motorized traffic flow at the intersection and to carry out the space planning.The paper is supported by the content of National Natural Science Foundation of China "Optimum Self-Organization Mechanism and Relevant Design Parameters of Expressway Continuous Interchange Traffic Flow(No.51878236)" and Research Project of Hefei Key Engineering Construction Administration "Research on the Key Technology of Hefei Expres sway System Evaluation and Traffic Design(No.2019FFCJ4364)".First of all,the paper studies the traffic characteristics of non-motor vehicles by turning left to background of non-vehicle integration at urban intersections.This paper introduces the investigation and processing process and method of the data required for the experiment,and then explores the basic and release characteristics of non-motor vehicles from many levels.Secondly,the paper analyzes the left turn street pattern and expansion wid th characteristics of non-motorized vehicles.This paper focuses on exploring the applicable conditions of the left-turn mode of non-motor vehicles at intersections,studies the expansion width calculation method of left-turn non-motor vehicles,then analyzes the relationship between the maximum expansion width and various influencing factors by means of the measured data,constructs a calculation model of the maximum expansion width of the left-turn non-motor vehicle flow,and verifies the accuracy and com patibility of the model.Thirdly,the paper studies the effect of left-turn non-motorized vehicles on the ability of intersection passage.Focus on the traffic conflict from many angles to carry out a detailed analysis,and through the measured data to exp lore the relationship between the maximum expansion width and the left turn non-conflict,the observation method of the conflict and the spatial distribution of the conflict point,and build a left turn non-conflict number model,and then through the impact factor to reflect the left turn non-motor vehicle flow maximum expansion width on the impact of motor vehicle traffic delay.Finally,the paper explores the planning method of the left turn space of the intersection based on the above contents.This pape r expounds the principle of space planning objectives and specific planning steps,and then elaborates the planning method of the left turn space of the intersection from many aspects,and analyzes the actual intersection as a case study,and discusses the concrete process of the implementation of the left turn space planning of the intersection.