Throughout California, I-80 was built along the corridor of U.S. Route 40 (US 40), eventually replacing this designation entirely. The prior US 40 corridor itself was built along several historic corridors in California, notably the California Trail and Lincoln Highway. The route has changed from the original plans in San Francisco due to freeway revolts canceling segments of the originally planned alignment. Similarly in Sacramento, the freeway was re-routed around the city after plans to upgrade the original grandfathered route through the city to Interstate highway standards were cancelled.