The US’s most famous road celebrates its centenary. The 2,400-mile highway crosses eight states and three time zones from Chicago to LA The US’s most famous road celebrates its centenary. The 2,400-mile highway crosses eight states and three time zones from Chicago to LA Traffic passes under a neon Route 66 sign at the west end of Albuquerque, New Mexico. Photograph: Susan Montoya Bryan Top: a portion of Route 66 winds through the countryside in Baxter Springs, Kansas. Photograph: Jeff Roberson.