Most of the road was bypassed in 1933 by the Ridge Route Alternate, then U.S. Route 99 (US 99), which has since been upgraded to a modern freeway, Interstate 5 (I-5).
Most of the road was bypassed in 1933 by the Ridge Route Alternate, then U.S. Route 99 (US 99), to handle the increased levels of traffic as well as remove many of the curves. The Ridge Route Alternate has since been upgraded to a modern freeway, Interstate 5 (I-5).