Why is Logistics Planning Hard?
With the exception of logistics planners, people generally do not realise how difficult it is to create a good transport schedule. There are all the operational complexities of time constraints, vehicle constraints, driver rules, customer requirements etc., but on top of that the actual size of the problem to be solved is much larger than you might think.
Even the relatively straightforward example of a single vehicle doing a delivery round to customers is a big problem to solve if you need to visit more than a handful of locations. The number of possible routes the vehicle could take to visit all the sites is much larger than might be expected.
Click on the image to the left for an explanation of how the size of the problem grows faster than exponentially with the number of visits.