The following sentences should replace the errant sentences on pages 887–888 of the published paper.
We observe that if routes are weighted by 2017 tonnage (i.e., reflecting the state of freight in a recent year), average relative-impacts for health (in Figure 1a: “ZWA” values) are larger than if routes carry equal weightage (“ZSA”). This result indicates that the health-impact difference between two modes is greater for freight-weighted comparisons than for unweighted comparisons.