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| Index | Definition | Unit |
|
| Feeder bus stop | — |
| Feeder bus route | — |
|
| Collections |
| Collection of feeder buses | — |
| Collection of feeder bus stops | — |
| Collection of metro stations | — |
| Candidate collection of feeder bus routes | — |
| Collection of feeder bus transfer stations | — |
|
| Parameters |
| Number of passengers taking feeder bus route at stop | Person |
| Number of passengers transferring from feeder bus to metro | Person |
| Maximum cross section passenger flow of feeder bus route | Person |
| Departure interval of feeder bus route | min |
| Service time of feeder bus | h |
| Operating cost per unit mileage of feeder bus | CNY/km |
| Average time for each passenger to get on the feeder bus | s |
| Average time for each passenger to get off the feeder bus | s |
| Time spent by passengers in elevators and other facilities in metro stations | min |
| Parking time of the metro train at the metro station | min |
| Minimum service time of each feeder bus | h |
| Maximum service time of each feeder bus | h |
| The average speed of the feeder bus | km/h |
| The walking distance from the bus transfer station to the metro station | km |
| The average walking speed of passengers | km/h |
| The average waiting time factor of passengers | — |
| Average load factor of feeder bus | % |
| Approved passenger capacity of feeder bus | Person |
| Average travel time value of passengers | CNY/h |
| Importance factor | — |
| Number of available feeder buses | veh |
| The minimum load factor of the feeder bus | % |
| The maximum load factor of the feeder bus | % |
| The path length between the feeder bus stop and the bus transfer station | km |
| Length of feeder bus route | km |
| The minimum length of the feeder bus route | km |
| The maximum length of the feeder bus route | km |
| Departure frequency of feeder bus route | veh/h |
| Minimum departure frequency of feeder bus route | veh/h |
| Maximum departure frequency of feeder bus route | veh/h |
| The arrival time of the feeder bus at the bus transfer station | — |
| The arrival time of the metro train at the metro station | — |
| The departure time of the metro train at the metro station | — |
| Decision variables |
| Whether the feeder bus route passes the bus stop immediately after passing the bus demand stop ; yes means ; otherwise, | — |
| Group size | — |
| The position of the particle | — |
| The speed of the particle | — |
| Inertia weight | — |
| Acceleration weights for particles flying towards individual extremum and group extremum | — |
| A random number between 0 and 1 | — |
| The position of the optimal solution found so far by the particle itself | — |
| The location of the optimal solution found so far is in the neighbourhood of the particle | — |
| The position of the optimal solution found so far in the subgroup of the particle | — |
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