The four theme parks, Magic Kingdom, Epcot, Disney's Hollywood Studios, and Disney's Animal Kingdom, as well as Disney Springs, operate as the five primary hubs. Each of the four theme parks has service to the 22 resorts, as well as to the other parks. Disney Springs has service only to the resorts, except for one-way service from the theme parks to Disney Springs after 4 p.m. Bus service is not provided on some routes served by monorail, skyliner, or watercraft, for example between Epcot and the Magic Kingdom, and between the Magic Kingdom or Epcot to resorts on the monorail line. Both water parks require guests to transfer at either Disney's Animal Kingdom for Blizzard Beach or Disney Springs for Typhoon Lagoon, as there is no direct service to and from Disney resort hotels. ESPN Wide World of Sports Complex is served only on select days, and only to and from Pop Century, Caribbean Beach, and All-Star Resorts. Direct transportation between the spokes (the resorts) is not provided, unless they happen to be on the same bus route. Buses also are used for internal resort guest transportation within several of the larger resorts. Disney Transport buses also carry Disney World employees around the resort. The Transportation and Ticket Center (TTC) acts as the primary hub for the Walt Disney World Monorail System, as well as a transfer point for watercraft service. As of late 2013, Disney Transport buses no longer transport visitors to the TTC; however, other bus services still use the TTC, such as the Orlando area's Lynx public bus system, which also stops at Disney University and Disney Springs' West Side section. Beginning in 1983, buses' destinations were marked by a small colored flag on the front of the bus. At the time of the flags' introduction, the resort consisted of two parks, four hotels, the TTC, and the Disney Shopping Village; there were also three bus routes that ran exclusively within the Fort Wilderness Resort. Handbooks were provided so travelers could match the flags with the destinations. However, this became increasingly impractical as more parks and hotels were added, and the flags were retired from the buses in 1995. Now, the destination or destinations are displayed on the electronic destination sign on the fronts and sides of each bus. Newer buses (made from 2015 onward) also have destination signs on the backs of each bus. Fleet Disney