Modeling And Optimization Of Dual-mode Commuting Pattern On The Corridor With Peak-only Bus Lanes

With the continuous development of the economy,the number of private cars has risen sharply.Limited road resources can not meet the growing demand for cars and the traffic in large cities is becoming increasingly congested.But,the congestion can not be well alleviated under a series of policies,such as restriction of purchase,license-plate lottery and traffic restrictions based on the last digit on a license plate policy.The public transport has gradually been valued by large and medium-sized cities in China due to its advantages such as environment-friendly,efficient and cost-effect.It has become a common understanding to give priority to the development of the public transport,and developing the public transport vigorously is the main way to alleviate traffic congestion in cities.It is an important measure to develop public transport by setting up bus lane which can well promote the bus operation speed,reduce the travel time,so as to induce some commuters travel by bus transit but private cars,thus alleviates the traffic congestion to some degree.The bus lane have two categories,i.e.,complete isolated bus lane and peak-only bus lane.Peak-only bus lanes(PBLs)is widely used by its advantage ofnever relying on expanding any other special road resources,but only adding the marking lines on the existing roads.However,What the impact of the PBLs on the travel behaviors of different travel mode commuters is?How to set the PBLs to make the efficiency of the urban traffic system highest?These problems above need to be solved urgently,so as to effectively guide the traffic practice of the PBLs.Based on the bottleneck model,this paper establishes the model for choosing travel time and mode when taking account of the PBLs.In this model,it is assumed that there are only two alternative travel modes for commuters,i.e.,auto mode and bus mode.The paper analyzes the influence on the operation efficiency of the commuting traffic system when meeting different travel demand,different capacity occupied by the PBLs,different opening period of the PBLs and different bus frequency.The numerical results show that it will not always be beneficial when extending the length of period of the PBL without any limit,and the proper capacity of the PBLs is essential.Then,It's found that the travel cost of both two modes will not increase at the optimal capacity occupied by the PBLs corresponding with different length of open period when keep the total travel demand fixed.Finally,we combinatorial optimization of the capacity of the PBLs,the open period of PBLs and the bus frequency to minimize the total system cost(i.e.,running cost of bus company and travel costs of the commuters)by genetic algorithms with the travel demand remains unchanged.The results show that it can minimize the total cost of the system when giving proper configuration of the PBLs and the bus frequency,thereby improve the operational efficiency of the road traffic system to some degree and enhance the total social benefits,and the conclusions can provide decisions support correspondingly for traffic management departments.