Research On Operation State Analysis Method Of National And Provincial Highway Network In Ningbo

As an important transportation channel in China,the highway network plays an important role in both freight and passenger transportation.The good running status of the road network is the key to ensuring the high efficiency of the road network.The good running status of the road network is the key to ensuring the high efficiency of the road network.With the rapid development of our country’s economy,the demand for traffic has continued to increase.Also,the pressure on the road network has increased sharply,and the state of traffic operation has continued to decline,and the problem of traffic congestion has become increasingly serious,which greatly affect the safety of travel,and is easy to cause traffic accidents.With the continuous development of China’s urban agglomerations and the establishment of representative economic circles in the Greater Bay Area,Beijing-Tianjin-Hebei,etc.,the exchanges between cities will become closer and road transport will play a greater role.Therefore,a scientific analysis of the traffic status of the road network to ensure the good running status of the road network will not only help improve the current road network transportation efficiency,but also serve as a reference or guidance for future planning and design.This article starts with the traffic distribution theory and the road resistance function,which analyzes the advantages and disadvantages of various road resistance functions currently used,and puts forward the basic form of generalized impedance function suitable for all levels of the road network,and uses the actual data of Ningbo City to calibrate the model parameters,so that the road resistance function conforms to the actual situation of the road in Ningbo City,and make the impedance function localize.Secondly,the equilibrium flow is calculated according to the traffic distribution model and related algorithms.Based on the analysis method of the equilibrium flow,from the perspective of the whole highway network,according to the distribution characteristics of the highway network flow,combined with the Gini coefficient and the imbalance coefficient,the traffic distribution of the whole highway network respectively on holidays and non-holidays as well as the peak and peak periods in these two periods are analyzed.By judging the overall traffic distribution of the road network and the balance of the path,this paper finds the unevenness in the road network,and uses the road network congestion core to define the weakest part of the road network operating state.Finally,taking Ningbo road network as an example,the application of this analysis method is studied.By using Gini coefficient,the traffic distribution of Ningbo highway network is obtained,that is,it is at a relatively reasonable level during holidays,and at a relatively average level during non-holidays.Both time periods are in a balanced state,but the unevenness of the traffic distribution during holidays is greater than that of nonholidays(daily time),the unevenness of the traffic distribution during the peak period is greater than that during the non-peak period.By using the imbalance coefficient,the path with a large degree of imbalance is found,and the road network congestion kernel in the highway network is identified.Based on the Gini coefficient,a targeted optimization strategy is proposed for the road network congestion according to different management radius.The application of this analysis method provides a theoretical basis and reference for the analysis of the operation status of Ningbo’s highway network.