In 1964, the state of California decided to eliminate or curtail most of the U.S. routes within its borders. This action was intended to reduce route-numbering confusion for U.S. routes parallel to new Interstate highway corridors, but it also resulted in the creation of several lengthy state routes that replaced the original U.S. routes. Some of the routes eliminated in 1964 were U.S. 40, 60, 66, 70, 80, 91, 99, 101A, 399 and 466. Other routes, such as U.S. 50, 101 and 395 were curtailed in length. Remnants of these routes include today's California 60 (U.S. 60), California 86 (old U.S. 99), California 91 (U.S. 91), California 99 (old U.S. 99), Interstate 10 (old U.S. 60-70) and Interstate 40 (old U.S. 66).