[distant_hat]

I worked with routing in a logistics company in India. The whole last mile delivery had so many special cases that we stopped trying to model them all. Drivers would take routes to avoid cops, or go toward a cop they knew (they had paid off in the past). Drivers would not go into each others' territories (so 2 drivers working for the same company would not deliver if their areas overlapped). For delivery people on 2-wheelers, all road rules were optional. They would go down wrong way on one-way roads etc. (we could track them, we called them 'dirty routes'). Drivers would prefer their own routes even when we gave better routes. Sometimes better was vaguely defined, since we might think this route save 10% time so is better, and he might think my favorite paan shop is on that route, so the other route is better.