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Interstate 380 (California)

Interstate highway in California

Field	Value
state	CA
type	I
alternate_name	Quentin L. Kopp Freeway
route	380
section	608
map
map_custom	yes
map_notes	I-380 highlighted in red
length_mi	3.3
length_ref
established	1964
counties	San Mateo
direction_a	West
terminus_a	in San Bruno
junction	{{plainlist
*{{Jct	state	CA	SR	82}} in San Bruno
direction_b	East
terminus_b	in South San Francisco
previous_type	SR
previous_route	371
next_type	US
next_route	395

in San Bruno Interstate 380 (I-380) is a short 3.3 mi east–west auxiliary Interstate Highway in the San Francisco Bay Area of Northern California, connecting I-280 in San Bruno to US Route 101 (US 101) near San Francisco International Airport. The highway primarily consists of only three intersections: I-280, State Route 82 (SR 82/El Camino Real), and US 101. Like the nearby I-280, I-380 never connects to I-80, its parent Interstate Highway. However, there is no rule that says that spur routes need to do so. (Similarly, the spur route I-795 branches off from I-695, a beltway around Baltimore, and is only indirectly linked to I-95.)

I-380 is officially known as the Quentin L. Kopp Freeway, named after the prominent California state senator from San Mateo County. This highway was previously named the Portola Freeway to honor the 18th-century Spanish explorer Gaspar de Portolá, whose expedition in 1769–1770 discovered the San Francisco Bay, from a viewpoint on the Sweeney Ridge located between San Bruno and Pacifica.

Route description

Along eastbound on I-380 near the SR 82 exit. Note the very broad freeway median.

The entirety of I-380 is defined in section 608 of the California Streets and Highways Code as Route 380, and that the highway is from:

(a) Route 1 near Pacifica to Route 280 in San Bruno. (b) Route 280 in San Bruno to Route 101 in the vicinity of the San Francisco International Airport.

The segment defined in subdivision (a) remains unconstructed, and is not included in the Federal Highway Administration (FHWA)'s Interstate Highway route logs.

I-380 begins at a junction with I-280 in San Bruno. This junction was only partially built, with room to accommodate a proposed freeway extension west toward SR 1. The freeway itself lacks overhead guide signs mentioning I-380. It then travels east through the city of San Bruno, intersecting with SR 82 (El Camino Real) before reaching US 101.

At its terminus at US 101, the mainline lanes of I-380 continue to North Access Road. The ramps to and from southbound US 101 provide connections to collector–distributor roads leading directly to San Francisco International Airport, allowing traffic between the Interstate and the airport to avoid merging with the main traffic lanes of US 101.

I-380 is part of the California Freeway and Expressway System and is 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 (FHWA).

History

There were plans to extend I-380 west to SR 1 (Cabrillo Highway), but, due to the route's passing over the San Andreas Fault and opposition from members of the local community, this project was abandoned. The westbound lanes of I-380 branch off to the right at I-280, leaving a wide, paved space which would carry the freeway extension under I-280 toward SR 1. This space is currently often used as storage space for equipment used in highway maintenance. A pair of unused bridges crossing over the I-280 south to I-380 east offramp remain as evidence. Furthermore, exit numbers assigned at I-380 start at 5 instead of 1 or 0, assuming there would still be an extension to SR 1.

Exit list

Under the official exit list by Caltrans, mileage is measured from the unconstructed western terminus at SR 1 near Pacifica.

References

(December 31, 2021). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways". [[Federal Highway Administration]].
"Section 608". California Office of Legislative Counsel.
{{CAFESystem
{{FHWA NHS map
{{FHWA NHS
Fredricks, David. (April 14, 2014). "The Interstate 380 controversy". San Mateo Daily Journal.
Warring, KS. (2009-01-29). "Interstate 380 Freeway Interchanges". [[Caltrans]].

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

interstate-80 interstate-highways-in-california san-francisco-bay-area-freeways auxiliary-interstate-highways roads-in-san-mateo-county,-california

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