 In 2006, Tijuana underwent a major overhaul of its existing system of guayines, or shared fixed-route station wagons, forcing the replacement of the guayines with new models of vans, serving as fixed-route taxis.Major transit hubs include Centro (Downtown Tijuana), Otay, Soler, and the "Cinco" y "Diez" avenues.Taxi lines operating in the city include Free Taxis, those that do not maintain a specific route; Economic Taxis; Diamond Taxis – black or yellow cabs; and regular taxis maintaining a set route.