Figure 3

Example of our approach to filtering minimum-route paths. Paths 1 and 2 are kept because their shipping distances are not longer than 150% of the shortest distance, nor are they redundant with any of the other paths. Paths 3, 4, and 5 are all redundant with at least one other path, and paths 4 and 5 are additionally filtered based on their shipping distance. In this example, none of the paths would be filtered based on the detour ratio method, since the absolute detour ratio (3.93) is larger than all of the relative detour ratios