| Transportation time of perishable shipment |
| Handling time of perishable shipment |
| Shelf life of a perishable product in shipment |
| Quantity of perishable products in shipment |
| Quality of a perishable product in shipment |
| =1 if route segment |
| =1 if route |
| =1 if mode |
| Transportation time value for a perishable product in shipment |
| Transportation time value for a perishable product in shipment |
| Slope of linear segment |
| Intercept of linear segment |
| Large positive number |