91 Express Lanes
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| Route information | ||||
| Defined by | ||||
| Maintained by Caltrans | ||||
| Length: | 59.047 mi (95.027 km) | |||
| History: | 1930s as a highway; 1964 as number | |||
| Major junctions | ||||
| West end: | Vermont Avenue in Gardena | |||
 I-110 in Los Angeles I-710 in Long Beach I-605 in Cerritos I-5 in Anaheim SR 57 in Anaheim SR 55 in Anaheim SR 241 in Anaheim I-15 in Corona
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| East end: |
  I-215 / SR 60 in Riverside
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State Route 91 (SR 91) is a major east–west freeway located entirely within Southern California and serving several regions of the Greater Los Angeles metropolitan area. Specifically, it currently runs from Vermont Avenue in Gardena, just west of the junction with the Harbor Freeway (Interstate 110), east to Riverside at the junction with the Pomona (State Route 60 west of SR 91), and Moreno Valley (SR 60 and I-215 east of SR 91) freeways. The route is part of the California Freeway and Expressway System. SR 91 is part of the State Scenic Highway System from SR 55 to the east city limit of Anaheim, in the western part of the Santa Ana Canyon, and is eligible for the system through the canyon to Interstate 15.
SR 91 inherited its route number from the mostly decommissioned US 91, which passed through the Inland Empire in a northeasterly direction on its way to Las Vegas, Salt Lake City, and points beyond. Those segments of US 91 are now parallel to, or have been replaced altogether by, I-15. SR 91 officially used to head west all the way to the Pacific Coast Highway (State Route 1) in Hermosa Beach, but this segment was relinquished to local governments in 2003, and is no longer part of a state highway.
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