Tour Context
What a tour policy is given to decide with.
The vehicle, so a policy can ask where it is and how far away things are through the movement seam rather than through any one substrate; and the layout, for distances between two places, which are facts about the layout and not about any vehicle.
Functions
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How far apart two places are, along the path between them.
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How far the vehicle is from location now, along the path it would take.
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The travel a stop sequence costs, starting from where the vehicle is now.