California State Route 92

The freeway segment of SR 92 at the US 101 interchange in San Mateo

Aerial view of SR 92, with its US 101 interchange and its path across the San Mateo Bridge

Aerial view toward the western end of SR 92, from San Mateo to Half Moon Bay

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,[3] and a small portion near SR 1 as well as the entire portion east of I-280 are part of the National Highway System,[4] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[5] SR 92 is eligible for the State Scenic Highway System,[6] but it is not officially designated as a scenic highway by the California Department of Transportation.[7]

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.

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 converted into a three-level combination interchange 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.[8] A similar cloverleaf interchange at SR 82 was rebuilt in 2018 into a partial cloverleaf interchange.

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 to an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see California postmile § Official postmile definitions).[1] 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.

County	Location	Postmile [1][9][10]	Exit [11]	Destinations	Notes
San Mateo SM 0.00-R18.80	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	12A	SR 82 (El Camino Real)	Formerly signed as exits 12A (south) and 12B (north)
		R11.61	12B	Delaware Street	Formerly signed as exit 12C
		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 Francisco Bay		R14.44– R0.00	San Mateo–Hayward Bridge (westbound toll only)
Alameda ALA R0.00-8.22	Hayward	R4.48	24	Clawiter Road, Eden Landing Road
		R5.12	25A	Industrial Boulevard
		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; former SR 17
			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       Concurrency terminus       Electronic toll collection       Incomplete access

•  California Roads portal
•  San Francisco Bay Area portal

Wikimedia Commons has media related to California State Route 92.

• Caltrans: State Route 92 highway conditions
• Caltrans Traffic Conditions Map
• California Highway Patrol Traffic Incidents
• Bay Area FasTrak – includes toll information on the San Mateo–Hayward Bridge and the other Bay Area toll facilities
• California @ AARoads.com - State Route 92
• California Highways: SR 92