California State Route 24

State Route 24 in the U.S. state of California is a heavily traveled east - west freeway in the eastern side of the San Francisco Bay Area of northern California that runs from the Interstate 580/Interstate 980 interchange in Oakland, and through the Caldecott Tunnel under the Berkeley Hills, to the Interstate 680 junction in Walnut Creek. It lies in Alameda County, where it is highly urban, and Contra Costa County, where it passes through wooded hillsides and suburbs.Route descriptionThis route is part of the California Freeway and Expressway System and is eligible for the State Scenic Highway System. Caltrans has only designated it as a scenic highway between the eastern end of the Caldecott Tunnel and I-680, however. SR 24 is designated as both the Grove Shafter Freeway (named after streets the route travels along - Grove Street was later renamed Martin Luther King Jr. Way) and the William Byron Rumford Freeway (honoring the first African American elected to a state public office) from the Caldecott Tunnel to the I-580 interchange segment of the MacArthur Maze, continuing henceforth as I-980 to the terminus with I-880.