California State Route 92
State Route 92 (SR 92) is a state highway in the U.S. state of California, serving as a major east-west corridor in the San Francisco Bay Area. From its west end at State Route 1 in Half Moon Bay near the coast, it heads east across the San Francisco Peninsula and the San Mateo–Hayward Bridge to downtown Hayward in the East Bay at its junction with State Route 238 and State Route 185. It has interchanges with three freeways: Interstate 280 (the Junipero Serra Freeway), U.S. Route 101 (the Bayshore Freeway) in or near San Mateo, and Interstate 880 (the Nimitz Freeway) in Hayward. It also connects indirectly to Interstates 238 and 580 by way of Hayward's Foothill Boulevard, which carries Route 238 and flows directly into Route 92.
SR 92 highlighted in red
|Defined by Streets and Highways Code § 392|
|Maintained by Caltrans|
|Length||27.769 mi (44.690 km)|
|West end||SR 1 in Half Moon Bay|
| I-280 near San Mateo|
US 101 in San Mateo
I-880 in Hayward
|East end||SR 185 / SR 238 in Hayward|
|Counties||San Mateo, Alameda|
Between Half Moon Bay and Interstate 280, Route 92 winds through the Coast Range as a narrow, mainly undivided two and three lane highway with a switchback turn. The east-bound uphill portion was upgraded with a long passing lane. Between Interstate 280 and Interstate 880 it is entirely a divided multilane highway, including the toll San Mateo-Hayward Bridge, the longest span across the San Francisco Bay. East of Interstate 880 the route becomes a divided surface street in Hayward, locally known as Jackson Street.
State Route 92 traverses through significant habitat areas including wetland, California oak woodland, chaparral and grassland. In one serpentine soil location near Crystal Springs Reservoir, it passes near one of the only known colonies of the endangered wildflower Pentachaeta bellidiflora and near one of the limited number of colonies of the endangered Eriophyllum latilobum.
SR 92 is part of the California Freeway and Expressway System, and a small portion near SR 1 as well as the entire portion east of I-280 are part of the National Highway System, a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration. SR 92 is eligible for the State Scenic Highway System, but it is not officially designated as a scenic highway by the California Department of Transportation.
The San Mateo section was once referred to as the 19th Avenue Freeway which was the street name where the freeway now exits. Parts of the street remain. This section is also known as the J. Arthur Younger Freeway; J. Arthur Younger was a United States Representative who served during the 1950s and 60s. 
All of Route 92 that is not already a freeway or a toll bridge has been proposed as a freeway, none of which has been built. An upgrade of the intersection with Main Street in Half Moon Bay is in the late planning stage. The old cloverleaf interchange with Interstate 880 was rebuilt with direct ramp replacements for two of the tight "cloverleaf" ramps, and a new wider and taller overpass to carry Route 92 over Interstate 880. The project took four years and was completed in October 2011. A similar cloverleaf interchange at SR 82 was also rebuilt in 2018.
Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see the list of postmile definitions). Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.
|Half Moon Bay||0.00||SR 1 – San Francisco, Santa Cruz||West end of SR 92|
|0.20||Main Street – Downtown Half Moon Bay||Former SR 1|
|||5.19||SR 35 south (Skyline Boulevard) – Big Basin||West end of SR 35 overlap|
|||7.19||SR 35 north (Skyline Boulevard) – San Francisco||East end of SR 35 overlap|
|||West end of freeway|
|||R7.31||8||I-280 (Junipero Serra Freeway) – San Francisco, San Jose||Signed as exits 8A (south) and 8B (north) eastbound; I-280 exit 33|
|San Mateo||R7.93||9A||Ralston Avenue – Belmont||Former Legislative Route 214|
|R8.67||9B||De Anza Boulevard, Polhemus Road|
|R9.38||10||West Hillsdale Boulevard|
|R10.56||11||Alameda de las Pulgas|
|R11.21||12||SR 82 (El Camino Real)|
|R12.14||13||US 101 (Bayshore Freeway) – San Francisco, San Jose||Signed as exits 13A (south) and 13B (north); US 101 exit 414B|
|Foster City||R12.78||14A||Mariners Island Boulevard, Edgewater Boulevard|
|R13.61||14B||Foster City Boulevard, East Hillsdale Boulevard|
|San Mateo–Hayward Bridge over San Francisco Bay|
|Hayward||R4.48||24||Clawiter Road, Eden Landing Road|
|R5.76||25B||Hesperian Boulevard – San Lorenzo|
|6.39||26||I-880 (Nimitz Freeway) – Oakland, San Jose||Signed as exits 26A (south) and 26B (north); I-880 exit 27|
|East end of freeway|
|6.78||Santa Clara Street||Serves CSU East Bay|
|8.22||SR 185 / SR 238 (Mission Boulevard, Foothill Boulevard) to I-580||East end of SR 92; access to SR 185 is via a left turn on A Street from SR 238 north|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- Faigin, Daniel P. "County Highways - State Route 92". www.cahighways.org. Retrieved 2008-07-21.
- California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original (XLS file) on June 30, 2015. Retrieved June 30, 2015.
- "Article 2 of Chapter 2 of Division 1 of the California Streets and Highways Code". Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
- Federal Highway Administration (March 25, 2015). National Highway System: San Francisco, CA (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved October 8, 2017.
- Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
- "Article 2.5 of Chapter 2 of Division 1 of the California Streets & Highways Code". California Office of Legislative Counsel. Retrieved February 6, 2019.
- California Department of Transportation (September 7, 2011). "Officially Designated State Scenic Highways and Historic Parkways". Sacramento: California Department of Transportation. Retrieved October 8, 2017.
- California Department of Transportation (July 2007). "Log of Bridges on State Highways". Sacramento: California Department of Transportation.
- California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
- California Department of Transportation, California Numbered Exit Uniform System, State Route 92 Freeway Interchanges, Retrieved on 2009-02-07.