|Jacob Dekema Freeway|
|Defined by S&HC § 621|
|Maintained by Caltrans|
|Length:||28.016 mi (45.087 km)|
|South end:||I-5 in San Ysidro|
|I-8 in San Diego|
|North end:||I-5 near Del Mar|
Interstate 805 (I-805, and colloquially referred to as "the eight-oh-five") is a major north–south Interstate Highway in Southern California. It is a bypass of Interstate 5, running along the eastern areas of the Greater San Diego area from San Ysidro near the Mexico–U.S. border to near Del Mar.
The southern terminus of I-805 at I-5 in San Ysidro is less than a mile north of the Mexican border. I-805 then traverses through the cities of Chula Vista and National City before reentering San Diego. The freeway then passes though the San Diego neighborhoods of North Park, Mission Valley, Clairemont, and University City before terminating at I-5 in the Sorrento Valley neighborhood near the Del Mar city limit.
The route is officially known as the Jacob Dekema Freeway, after Jacob Dekema, a pioneering force from the California Department of Transportation (Caltrans) who helped shape the San Diego freeway system. It is also part of the California Freeway and Expressway System.
Eight to ten lanes throughout, Interstate 805 has evolved into a busy commuter route from the International Border into the exploding South Bay communities of Chula Vista (including Rancho del Rey and Eastlake) and National City. The freeway also leads into the relatively new business parks near University City (via Governor Drive and La Jolla Village Drive) and Sorrento Valley. As more companies locate along the route of Interstate 805, more traffic utilizes the route as an important connector to get from home to work. In addition to commuter traffic, the freeway is one of two north–south freeways that reach Mexico. Traffic to and from the border is also very common along Interstate 805.
The route begins at Interstate 5 near the Mexican border in a far south part of San Diego. As it begins its journey northward, it quickly interchanges with SR 905 before exiting the city and entering Chula Vista. In this city, it has exits with various local roads before exiting the city. Just outside the city, I-805 meets County Route S17, also known as Bonita Road, before interchanging with SR 54. The route then enters National City, where it meets Sweetwater Road and Plaza Boulevard before leaving the city and reentering San Diego.
It then continues northward through the city of San Diego, where it intersects SR 94, also known as Martin Luther King Jr. Freeway,. As it continues through downtown San Diego, it meets SR 15, the southern stub of I-15 It then meets El Cajon Boulevard, which was formerly signed as I-8 Business, then passes under Hazard Memorial Bridge that carries Adams Ave. before going over Mission Valley. I-805 then travels on the Mission Valley Viaduct, a towering reinforced concrete viaduct built in 1972, spanning over Mission Valley and the San Diego River. The viaduct is the top stack of the Jack Schrade Interchange over Interstate 8, which runs along the south side of Mission Valley and crosses underneath the viaduct perpendicularly and is San Diego County's only symmetrical stack interchange. The San Diego Trolley traffic also runs under the viaduct on the valley floor. It then meets SR 163, also known as Cabrillo Freeway. It then continues through suburban San Diego, where it meets SR 52 in Clairemont Mesa. North of SR 52, it closely parallels Interstate 5 near La Jolla. Passing under the Eastgate Mall arch bridge and entering Sorrento Valley, it finally meets its north end at I-5. At the I-5 interchange, which is also located along the widest freeway in the Interstate Highway System,SR 56 is accessible via Local Bypass.
The portion of the route north of Division Street (at the San Diego-National City boundary) roughly follows the boundaries of two Spanish royal land grants, dating from California's founding as a Spanish colony. The lands to the west of Interstate 805 were the "Pueblo Lands", granted directly to the town of San Diego to be subdivided; the lands to the east were granted to the Mission San Diego de Alcala, to be used as farm and ranch lands so that the mission could be self-supporting (through the labor of native converts). While the Mission land grant extends only north to approximately Miramar Road, the Pueblo Lands extend to the northern end of this highway.
Plans for I-805 were passed in legislature in 1959 as Legislative Route Number 241. It was approved as a chargeable interstate in 1958, and declared a signed state route in 1964. The freeway was opened in 1975.
A major expansion of the 805-5 merge zone was opened to traffic on April 3, 2007. Including HOV Lanes and local bypass lanes, this merge spans 22 lanes at the widest point. Work is also underway to add two HOV Lanes between State Route 52 and Mira Mesa Boulevard.
As of 2007, a three-year project is underway to allow robot controlled vehicles, including buses and trucks, to use a special lane. The intention is to allow the vehicles to travel at shorter following distances and thereby allow more vehicles to use the lanes. The vehicles will still have drivers since they need to enter and exit the special lanes. The system is being designed by Swoop Technology, based in San Diego County.
Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, and do not necessarily reflect current mileage. R reflects a realignment in the route since then. The entire route is in San Diego County.
|San Diego||0.49||I-5 south (San Diego Freeway)||Southbound exit and northbound entrance|
|Camino de la Plaza||Southbound exit and northbound entrance; last US exit|
|0.65||1A||San Ysidro Boulevard|
|1.81||1B||SR 905||Future I-905|
|Chula Vista||3.65||3||Main Street, Auto Park Drive|
|4.42||4||Olympic Parkway, East Orange Avenue|
|6.06||6||L Street, Telegraph Canyon Road|
|7.16||7||H Street||Signed as exits 7A (east) and 7B (west) southbound|
|7.76||7C||CR S17 (E Street)||Northbound exit is part of exit 7|
|8.85||8||SR 54 – Spring Valley, San Diego||Signed as exit 9 southbound|
|National City||9.05||9||Sweetwater Road||Signed as exit 8 southbound|
|San Diego||11.31||11A||43rd Street||Signed as exit 11B southbound; former SR 252|
|R11.36||11B||47th Street, Palm Avenue – National City||Signed as exit 11A southbound|
|13.51||13A||SR 94 (M. L. King Jr. Freeway)||Southbound access to SR 94 west is through exit 14|
|14.64||14||SR 15 north (Escondido Freeway)||Northbound exit and southbound entrance, future I-15 north|
|14.64||14||SR 15 south (Escondido Freeway) to SR 94 west||Southbound exit and northbound entrance, future I-15 south|
|15.95||15||North Park Way, University Avenue|
|16.43||16||El Cajon Boulevard||Former US 80|
|16.99||17A||Adams Avenue, Madison Avenue||Southbound exit and northbound entrance|
|17.65||17B||I-8 – San Diego, El Centro||Signed as exit 17 northbound|
|18.89||18||Murray Ridge Road, Phyllis Place|
|20.23||20A||Mesa College Drive, Kearny Villa Road||Northbound exit and southbound entrance|
|20.60||20B||SR 163 north (Cabrillo Freeway) – Escondido||Northbound exit and southbound entrance|
|20.60||20||SR 163 south (Cabrillo Freeway) – Downtown San Diego||Southbound exit and northbound entrance|
|21.65||21||Balboa Avenue||Former SR 274|
|22.56||22||Clairemont Mesa Boulevard|
|23.65||23||SR 52 – San Diego, Santee|
|25.48||25A||Nobel Drive||Northbound exit and southbound entrance|
|25.94||25B||La Jolla Village Drive, Miramar Road|
|27.07||27||Mira Mesa Boulevard, Vista Sorrento Parkway, Sorrento Valley Road||Signed as exits 27A (Mira Mesa Boulevard, Vista Sorrento Parkway) and 27B (Sorrento Valley Road) northbound|
|SR 56 east||Northbound exit and southbound entrance; exit is accessible via local bypass|
|28.50||I-5 north (San Diego Freeway) – Los Angeles||Northbound exit and southbound entrance|
- California Department of Transportation, State Truck Route List[dead link] (XLS file), accessed February 2008
- "CA Codes (shc:250-257)". Leginfo.ca.gov. Retrieved 2013-01-26.
- "Robot Buses Pull In to San Diego's Fastest Lane". Wired. July 24, 2007. Retrieved 2007-08-19.
- "2007 Named Freeways, Highways, Structures and Other Appurtenances In California". State of California Business, Transportation and Housing Agency, Department of Transportation (CalTrans). January 2007. p. 96. Retrieved 2008-01-27.
- Steve Schmidt, "Four new southbound lanes at I-5/805 merge set to open", San Diego Union-Tribune, 28 March 2007, page number unknown.
- California Department of Transportation (November 1984). "History of California's Interstate Routes".
- California Department of Transportation. "I-805 South Project". Retrieved 2011-01-11.
- California Department of Transportation, Log of Bridges on State Highways, July 2007
- California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
- California Department of Transportation, California Numbered Exit Uniform System, I-805 Northbound and I-805 Southbound, accessed February 2008
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