Research Article
Collaborative Vehicle Routing Problem in the Urban Ring Logistics Network under the COVID-19 Epidemic
| Symbol | Description |
| Sets | C | Set of customer points | H | Set of DC points | V | Set of all points |
| Parameters | | Distance from to | | Travel time from to | | Unit distance cost of distribution vehicles | | Transfer cost per unit distance per unit volume of goods | F | Fixed cost of vehicles | Q | Maximum vehicle load | | Initial cargo volume of distribution center | | Demand for goods of customer in distribution center | | 0-1 indicator variable, indicates whether the distribution center is directly connected | li | Earliest service time of customer | ei | Latest service time of customer | | Service time of customer |
| Decision variables | | Volume of goods on edge | | Value = 1 means that vehicle coming out from passes by edge , or value = 0 | | Time that vehicle starts to serve customer |
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