California State Highway 24
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SR 24 highlighted in red
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| Route information | ||||
| Defined by | ||||
| Maintained by Caltrans | ||||
| Length | 13.492 mi (21.713 km) | |||
| Existed | 1934 – present | |||
| Restrictions | Trucks carrying hazardous material are only permitted through the Caldecott Tunnel between 3:00 a.m. and 5:00 a.m. | |||
| Major junctions | ||||
| West end |
  I-580 / I-980 in Oakland
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 SR 13 in Oakland |
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| East end |
 I-680 / Mount Diablo Boulevard in Walnut Creek
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| Location | ||||
| Counties | Alameda, Contra Costa | |||
| Highway system | ||||
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State Route 24 (SR 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 (just east of the MacArthur Maze) 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.
SR 24 begins at the four-level interchange with Interstate 580 and Interstate 980 in Oakland; this interchange is located on top of Grove Shafter Park. SR 24 initially heads north before turning east near the Berkeley city limits. Route 24 rises from near sea level in downtown Oakland past its interchange with State Route 13, which is a freeway south of SR 24 (completed August 1999) and a surface street north of SR 24. After this, SR 24 crosses the Contra Costa County county line through the four-bore Caldecott Tunnel and offers some attractive views of the hilly terrain through which it passes. Some protection of the views comes from the highway's designation as a California Scenic Highway.
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