Had a drinking friend years ago who was a logistics expert for Sainsburys. He and his team measured every route possible to the inch as well as multiple load drop loading and unloading order to achieve the most economical delivery costs. Their left turns were swapped for right turns of course in the U K

No computers, all slide rules and written maths calculations, It worked too it was proved 90% effective overall when computer modelling was implemented and took over the tasks