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20 Guidebook for Understanding Urban Goods Movement safety-related risks to performance. For these reasons, proper design of the physical layout of gas stations is crucial. The ideal station configuration places storage tank delivery access as far away as possible from the retail pumps, and facility ingress is separated from egress, so a deliv- ery truck does not need to back up while surrounded by automobiles or other traffic. Older stations in urban markets may lack these features. Access restrictions typically concern noise and time of day. Although stores usually accept delivery 24 hours a day, there can be neigh- borhood delivery limitations at night or during rush hour. Greater flexibility for delivery win- dows results in better service, because the system already functions under tight constraints. Case Illustration 3: Apparel Retail Supply Chain Overview Within the U.S. clothing store industry, the very large apparel companies, each encompassing some specialty brands, account for a dominant share of the total market. Each individual specialty brand can have a national chain of retail locations, sometimes numbering in the hundreds. The products of each specialty brand also often are available for catalog and online purchase. Much of the apparel sold by these companies is manufactured overseas and transported to the United States by either ocean container or aircraft. After arrival in the United States, shipments are transferred to a container freight station, cleared through customs, and sorted into truck deliveries bound for regional DCs. From these DCs, product is transported by outbound truck either to specific retail locations or, in the case of online or catalog orders, directly to the consumer. Delivery is a multi-stop trip to stores, or to a mixture of commercial and residential locations. See Exhibit 3-3. Exhibit 3-3. Apparel flowchart. 18 Wheeler Small Truck Aircraft Intermodal Rail