Interstate 10 in California
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| Route information | ||||
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| Maintained by Caltrans | ||||
| Length: | 243.31 mi (391.57 km) | |||
| Existed: | August 7, 1947 by FHWA July 1, 1964 by Caltrans – present |
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| Major junctions | ||||
| West end: |
 SR 1 in Santa Monica
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| East end: |
  I-10 / US 95 at Arizona state line |
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Interstate 10 (I-10, The 10), a major east–west Interstate Highway, runs in the U.S. state of California east from Santa Monica, on the Pacific Ocean, through Los Angeles and San Bernardino to the border with Arizona. In the greater Los Angeles area, it is known as the Santa Monica Freeway and the San Bernardino Freeway, linked by a short concurrency on Interstate 5 (the Golden State Freeway) at the East Los Angeles Interchange.
Interstate 10 also has portions designated as either the Rosa Parks Freeway or the Redlands Freeway.
The California Streets and Highways Code defines Route 10 from "(a) Route 1 in Santa Monica to Route 5 near Seventh Street in Los Angeles. (b) Route 101 near Mission Road in Los Angeles to the Arizona state line at the Colorado River via the vicinity of Monterey Park, Pomona, Colton, Indio, and Chiriaco Summit and via Blythe.." Despite the legislative definition, Caltrans connects the two sections of the route by cosigning I-10 down Interstate 5 between the East LA Interchange and the Santa Monica Freeway, negating a section of the San Bernardino Freeway west of I-5. This short section of Route 10 between Route 5 and Route 101, which was formerly defined as Route 110 (signed as Interstate 110) until 1968, is signed overhead for I-10 eastbound and for U.S. 101 westbound. This I-5/I-10 cosigning is consistent with the Federal Highway Administration's Interstate Highway route logs that such an overlap exists for the segment of I-10 in California.
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