Solving the Tractor and Semi-Trailer Routing Problem Based on a Heuristic Approach

<table>An example of selecting unit-flow networks. Note: Black points denote depots. Lines denote the distribution of freight flows. Numbers near lines denote freight flow volume (unit: one semi-trailer).</table>

Mathematical Problems in Engineering

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Figure 3

Figure 3: Solving the Tractor and Semi-Trailer Routing Problem Based on a Heuristic Approach 