Milk run is the method you use logistics providers to get auto parts from all suppliers in the routes and deliver to production plants. This method can reduce traffic at the production plants. There will be fewer trucks because sometimes many suppliers used to deliver their supplies to the plants but now only logistics providers' truck with full-loaded of parts from different suppliers. Also, this will make inventory level decreases, because you will receive the parts many times a day, instead of getting a big lot once in a while. So cost in traffic management and holding cost decrease.