Donaldson et al. [8] studied a network of crossdocks for the US Postal Service where 148 Area Distribution Centers serve as crossdocks, each receiving, sorting, packing and dispatching mail according to operating schedules. Each distribution center serves as an origin as well as destination node where schedules were driven by mail delivery standards
Ratliff et al. [9] studied a load- driven network, in which deliveries take place when there are sufficient products waiting for transportation. They studied the North American automobile delivery systems to determine the ideal number and location of crossdocks in a network and how shipments flowed between them. In their study, a minimum inventory strategy was the key in attempting to minimize the number of vehicles at the mixing center (crossdocks). Chen, Guo and Lim [10] studied crossdocking network scheduling where time windows for deliveries and pickups are considered. They also considered crossdock-handling costs which are use to penalize delays.