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| Location of the ith shipper’s distribution center |
| Location of the consolidation center (if there is any) |
| Location of the end of the corridor |
| Distance from point a to point b (e.g., is the distance from distribution center i to the consolidation center) |
| Customer density for shipper i |
| Distance from the end of the corridor to the start of the service area |
| Distance from the end of the corridor to the end of the service area |
| r | Distance from the start of the service area to the end of the service area |
| S | Area of the service area |
| Vehicle speed when traveling on the corridor |
| Vehicle speed when traveling along and in the service area |
| B | Length of the corridor |
| w | Width of a zone |
| l | Length of a zone |
| Capacity of the vehicle |
| Total cost of delivery for shipper i without consolidation |
| Total cost of delivery for shipper i when shipper i and shipper j use a consolidation center to bundle their freight |
| Total line-haul travel time for shipper i without consolidation |
| Total local travel time for shipper i without consolidation |
| Total travel time for shipper i composed of total line-haul and local travel time |
| Total travel time for shipper i when shipper i and shipper j use a consolidation center to bundle freight |
| Ni | Total number of vehicles for shipper i without consolidation |
| Number of vehicles in the first leg of the trip from the distribution center to the consolidation center for shipper i |
| Number of vehicles in the second leg of the trip from the consolidation center to delivery points |
| Number of zones along the transverse direction |
| Number of zones along the radial direction |
| Unit cost per unit travel time |
| Unit fixed cost for each vehicle |
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