Science Fair Project Encyclopedia
- Another Interstate 580 exists in Reno, Nevada, but is signed only as US 395.
- The Interstate 580 number was also used for part of US 75 in Omaha, Nebraska.
Interstate 580 (MacArthur Freeway) in northern California is a heavily traveled, fairly long spur route of Interstate 80 that connects the San Francisco Bay Area to Interstate 5 in the state's Central Valley. The western terminus of I-580 is north of San Francisco in San Rafael, at a junction with U.S. Highway 101. The eastern terminus is with I-5 southeast of Tracy. It was named after General Douglas MacArthur in 1968. Leaving San Rafael, I-580 runs next to the San Quentin State Prison before crossing San Francisco Bay over the Richmond-San Rafael Bridge.
- San Rafael
- San Leandro
Intersections with other Interstates
- Joins Interstate 80 in Albany
- Separates from I-80 in Emeryville (junction is also the north terminus of Interstate 880)
- This intersection is known as the MacArthur Maze
- Interstate 980 (northern terminus of I-980) in Oakland
- Interstate 238 (eastern terminus of I-238) in Castro Valley
- Interstate 680 in Pleasanton
- Interstate 205 (western terminus of I-205) between Livermore and Tracy
- Interstate 5 southeast of Tracy
On the section of 10-lane freeway that is designated both I-80 and I-580, from Emeryville to Albany, the two routes are running in opposite directions. That is, while a vehicle is physically moving north on the road, it is on both I-80 East and I-580 West.
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