4.1.1. Assumptions

Some hypotheses are made before the study, as follows:

(1) Sites with the same name are treated as one docking site, and sites with different names are treated as different docking sites. Ignore the case where the individual docking sites have the same name but different docking locations.

(2) Ignore the situation that the uplink and downlink lines are different, and abstract the urban bus network into an undirected network. That is, if the site A can be reached from the site B through a certain line, the site B can also be reached from site A along the same line.

(3) Regardless of the difference in the frequency of vehicle departures and the number of bus lines connecting the two stations, that is, regardless of the connection weight problem in the network, the network is abstracted into an unweighted network.

(4) Due to the intersection of urban roads, T-junctions, etc., there are many places where bus lines meet. The point at which the bus line space intersects is not necessarily the bus stop site, so different bus lines are not connected here.
