Freight Time and Cost Optimization in Complex Logistics Networks

Figure 7

Distance versus quantity scatter plots for box truck carriers. Color indicates freight cost (key on right), normalized to [0, 1] for each carrier to have a minimum cost of 0 and a maximum cost of 1. Cost equations are obtained by performing regression analysis on each carrier. Weights are constrained to have positive values. In each cost equation (inset), L indicates the cost equation of the carrier, x denotes the distance in miles, q denotes the quantity in pounds, and E denotes the absolute error of the cost regression in dollars and as a percentage. Carrier names are omitted to preserve anonymity.