To improve the synergy between overlapping bus lines and reduce the capacity resource waste

a bus dispatching optimization method for overlapping lines was proposed considering passenger transfers. Based on the relative positions between the passenger origin-destination and the overlapping sections

passengers were divided into three categories

and the bus travel process of different categories of passengers at the stations in the overlapping area was investigated. In consideration of the passenger transfer behaviors on the overlapping bus lines

a departure interval collaborative optimization model was established

which takes the minimum total passenger travel time and minimum bus operating cost as objects and is constrained by departure interval

first departure time

and capacity limitations. The model was solved by genetic algorithm. Taking three overlapping bus lines in Harbin as an example

results show that after the model was optimized

the bus operating cost was reduced by 15.2%

total travel time of passengers reduced by 6.7%

and waiting time of passengers for three categories reduced by 3.2%

33.2%

and 18.6% respectively

which verified the effectiveness of the model. The research results provide a new perspective for the theoretical research of static dispatching methods for overlapping lines.