Dynamic Scheduling Strategy Of Urban Bus Lines Under The Influence Of Routes Overlapping

With the rapid development of China's national economy,the scale of the city has expanded rapidly,and the traffic demand of urban residents has also increased.At present,the road traffic carrying capacity of many large cities cannot meet the travel needs of residents,resulting in increasingly serious traffic congestion problems.As a transportation mode with strong carrying capacity and high transportation efficiency,public transportation is now recognized as a means to effectively alleviate the problem of urban road traffic congestion.In recent years,China has implemented a series of transportation policies to vigorously promote the construction of public transportation,which lead to the overlapping of multi-line bus operating areas.Different lines interact with each other,and the bus can't execute the scheduled driving plan,which affects the uniformity of the bus headway,which leads to the bus bunching.The bus bunching will increase passengers' waiting time at the stop,waste bus system resources,and reduce the attractiveness of bus travel modes.How to solve this problem is of great significance to the further improvement of the urban public transport system.City bus lines can be divided into lines with bus lanes and lines without bus lanes.Aiming at the high-frequency bus lines with bus lanes,this paper proposes a combined dynamic scheduling strategy based on road speed induction and multi-cycle signal control at intersections.By coordinating the bus speed cont rol with the multi-cycle signal adjustment,the bus can be accurately controlled between the stations,thereby improving the uniformity of the bus head time.For the line without bus lanes,this paper proposes a combined dynamic scheduling strategy based on bus holding and stop skipping.The strategy controls the stop time of the bus by means of stop skipping or changing the holding time,thereby adjusting the headway.Since multiple buses can skip or stop at the same station simultaneously,the strategy can control multiple lines at the same time,and reasonably allocate the carrying capacity of each line.Secondly,based on the operational characteristics of bus lines in different road environments,this paper establishes a prediction model for the motion status of bus under the influence of different scheduling strategies.Considering the influence of routes overlapping,the needs of different types of passengers and the impact on other social vehicles,a scheme optimization model is established for each of the two scheduling strategies.Finally,the bus routes in Meihekou City of Jilin Province are taken as an example to verify the scheduling methods established in this paper.The genetic algorithm is used to solve the optimal scheduling scheme and compare with the original scheme of the line.The results show that the scheduling method established in this paper can effectively improve the uniformity of bus head time and avoid the bus bunching in the case of less impact on social vehicles and bus speed.