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| Symbol | Description |
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| Network node set (all nodes including the start node and the end node) |
| Transportable node set |
| , transportation mode collection |
| Total quantity of goods to be transported in the multimodal transport model |
| Unit value of goods that need to be transported |
| Accident damage coefficient: from node city to node city , transport modeis used for transportation |
| Transportation mileage: from node city to node city , transport modeis used for transportation |
| Time delay coefficient: from node city to node city , transport modeis used for transportation |
| Unit transportation cost: from node city to node city, transport modeis used for transportation |
| Unit transfer cost: at the transferable node , the mode of transport is changed fromto |
| Transit time: at the transferable node , the mode of transport is changed from to |
| Average speed of transportation mode |
| Carbon emission factor: unit carbon emissions of transportation mode |
| Total carbon emissions allowed in the model |
| The maximum delivery time of the goods specified in the model |
| Decision variables: if transportation modeis selected from city to node city , then the value is 1, otherwise the value is 0 |
| Decision variables: if the mode of transportation changes from to in node city , then the value is 1, otherwise the value is 0 |
| represents the calculated value of total carbon emissions |
| The total transportation time from to |
| From the city to the city , the transportation volume of mode is adopted |
| From the city to the city , the transportation volume of mode is adopted |
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