Applying Propagation of Variability for City Deliveries/Pickups

So far, all transportation routing algorithm and heuristics assumes that delivery/pickup performance is the same whether one traverses the route in a clockwise or anti-clockwise fashion.

In a city like Singapore with lots of buildings, time spent at a delivery point can be much longer than point-to-point. If time spent at delivery points are more variable going from clock wise to anti clockwise using propagation of variability approach, then one can decide if the clockwise or anti-clocke wise routing is superior.