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| Notations | Definitions |
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| N | Bus index, n ∈ ∀N+, n ≠ 1 |
| I | Station number, i ∈ (1, 2, 3, …, s) |
| J | Interstation index, j ∈ 1, 2, 3, …, s − 1 |
| Passenger arrival rate at station i in time period m |
| M | Number of periods between to buses |
| The time it takes for each passenger to get on/off the bus |
| Dwell time of bus n at station i |
| Boarding number of bus n at the station i |
| The average speed of bus n travel at station interval j |
| The distance of the station intervals j |
| Travel time of bus n at station intervals j |
| The departure time of bus n at station k |
| A constant for the other time loss required at each station |
| Headway of bus n and bus n-1 at station i (the difference between the departure time of the two buses at the station i) () |
| U | Station set of short-turn vehicles operating |
| Q | Short-turn bus between full-length buses n − 1 and n |
| The number of passengers who board at station a and get off at station b, |
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