The historic U.S. Route 66 (US 66) ran east–west across the central part of the U.S. state of New Mexico, along the path now taken by Interstate 40. However, until 1937, it took a longer route via Los Lunas, Albuquerque, and Santa Fe, now roughly NM 6, I-25, and US 84. Large portions of the old road parallel to I-40 have been designated State Road 118 (NM 118), State Road 122 (NM 122), State Road 124(NM 124), State Road 333 (NM 333), three separate loops of Interstate 40 Business, and state-maintained frontage roads.