Interstate 380 (California)

Interstate 380 (I-380) is a short 1.7-mile (2.7 km) east–west auxiliary Interstate Highway spur in the San Francisco Bay Area of Northern California, connecting Interstate 280 in San Bruno to U.S. Route 101 near the San Francisco International Airport (SFO). The highway primarily consists of only three intersections: I-280, El Camino Real (State Route 82), and U.S. 101. Like the nearby I-280, I-380 never connects to Interstate 80, its parent Interstate Highway. However, there is no rule that says that spur routes need to. (Similarly, the spur route Interstate 795 branches off from Interstate 695, a beltway around Baltimore, and is only indirectly linked to Interstate 95.)

Interstate 380
Quentin L. Kopp Freeway
I-380 highlighted in red
Route information
Defined by Streets and Highways Code § 608
Maintained by Caltrans
Length1.670 mi[1] (2.688 km)
Existed1964–present
Major junctions
West end I-280 in San Bruno
 
East end US 101 in South San Francisco
Location
CountiesSan Mateo
Highway system
← SR 371→ US 395

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 eighteenth-century Spanish explorer Gaspar de Portolá, whose expedition in 1769-70 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.

I-380 begins at a junction with I-280 in San Bruno. This junction is really only partially built, allowing room to build a proposed freeway extension west towards State Route 1 (see below). The freeway itself lacks overhead guide signs mentioning I-380. It then travels east through the City of San Bruno, intersecting with State Route 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. Meanwhile, 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 Highway 101.

I-380 is part of the California Freeway and Expressway System,[2] and is part of the National Highway System,[3] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[4]

History

There were plans to extend I-380 all the way to State Route 1 (the Cabrillo Highway), but due to the route's passing over the San Andreas Fault and opposition from members of the local community, this project has yet to be tackled. The westbound lanes of I-380 branch off to the right at I-280, leaving a very wide, paved space which would carry the freeway extension under I-280 towards 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.

Despite the opposition, Chapter 2, Article 3, Section 608 of the California Streets and Highways Code still legally defines Route 380 as traveling from "Route 1 near Pacifica to Route 280 in San Bruno",[5] and the exit numbers assigned at I-280 start at five instead of one or zero.

Exit list

Mileage is measured from the unconstructed western terminus at State Route 1 near Pacifica. The entire route is in San Mateo County.

Locationmi[6]kmExit[6]DestinationsNotes
San Bruno5.478.805A-B I-280 (Junipero Serra Freeway) – San Francisco, San JoseWestbound exit and eastbound entrance; signed as exits 5A (north) & left 5B (south); west end of I-380; Exits 43B northbound & 43A southbound on I-280; stack interchange with westbound part being stub road
5.478.805C SR 82 (El Camino Real) – San BrunoSigned as exit 5 eastbound
6.23–
6.37		10.03–
10.25		6 US 101 (Bayshore Freeway) – San Francisco International Airport, San Jose, San FranciscoSigned as exits 6A (south) and 6B (north) eastbound; US 101 exit 423B
South San Francisco6.6010.627South Airport Boulevard/ North Access RoadEastbound exit and westbound entrance
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also
  •  California Roads portal
  •  San Francisco Bay Area portal

References
  1. 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.
  2. "Article 2 of Chapter 2 of Division 1". California Streets and Highways Code. Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
  3. Federal Highway Administration (March 25, 2015). National Highway System: San Francisco, CA (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved July 29, 2017.
  4. 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.
  5. "2005 California codes 300-635". 2005.
  6. Warring, KS (2009-01-29). "Interstate 380 Freeway Interchanges" (PDF). California Numbered Exit Uniform System. CalTrans.

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