Bicycle Route 66 does not always follow Historic Route 66. Deviations were made based on present-day conditions. Many miles of the route parallels interstates. When the interstate system was built, U.S. 66 became I-55, I-44 and I-40 so you'll ride on interstate shoulders and multiple frontage roads. Between Oatman, Arizona and Los Angeles this map section contains some of the most isolated stretches and some of the busiest urban stretches of Bicycle Route 66. Plan to carry extra provisions through the Mojave Desert between Needles and Barstow. There are two summits to cross Cady Summit and Cajon Summit. Expect urban riding conditions from San Bernardino to Santa Monica, with increasing traffic levels as you head west. Riding miles from Pasadena to Santa Monica on an early Sunday morning can help also. The route ends at the Santa Monica pier on the Pacific Ocean.