Some Thoughts on the Design for At-grade Intersections of Urban Road

Road intersections, as nodes in the road network, are the key to improving operational efficiency. Extensive practice has shown that a reasonable design of the intersection scheme will help to release the road capacity and improve the smoothness of traffic for various participants including motor vehicles and slow traffic. This paper, based on relevant domestic and foreign codes and other achievements, has put forward some thoughts on the design principles, design ideas and follow-up development of intersection engineering, aiming to provide a certain reference for relevant management, analysis and design work. Urban roads are the lifeblood of urban economic life and one of the important signs of development of urbanization. In the process that urban municipal roads are continuously being built into a network and road traffic demand is continuously being tapped and released, the “throat” effect of at-grade intersections of the road is constantly emerging. At the at-grade intersections, under the background of low traffic speed and a large number of people flows and vehicle flows interweaving at the intersection, designing a scientific and reasonable traffic organization scheme for intersections will help to improve the efficiency of the intersection and even the road section. However, the change in the design space brought about by the property line planning concepts such as “narrow roads, dense road networks” and “street all-factor planning and design”, as well as the trend of increasing complexity of urban underground pipelines and underground facilities, have put forward new requirements for the design of road intersections. But at the same time, for some intersection schemes designed according to the new design concept, due to the lack of a clear basis for examination and approval, there is a space for discussion. In view of this, it is necessary to think about and sort out the planning and design process of at-grade intersections, and on the basis of fully examining the three stages of planning design, engineering design and management control design, to put forward suggestions on planning design in the new era and new situation. The author is mainly engaged in the stage of engineering design, so this paper will put forward some thoughts on the at-grade intersection design from the perspective of engineering design and management control design.