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Interstate 280 Annual Average Daily Traffic (AADT)

State Mileage Cities Junctions
California 57.22 San Jose, Daly City, San Bruno, Mountain View, San Francisco Interstate 680, Interstate 380
Source: October 31, 2002 Interstate Route Log and Finders List

Interstate 280 California Annual Average Daily Traffic (AADT)

County Begin Milepost Location To: AADT
Santa Clara 0.00 Interstate 680 & U.S. 101; begin freeway Mc Laughlin Avenue - San Jose 133,000
Santa Clara 0.37 Mc Laughlin Avenue - S.J. 10th Street - San Jose 203,000
Santa Clara 1.29 10th Street - San Jose 7th Street - San Jose 180,000
Santa Clara 1.55 7th Street - San Jose CA 82 & 1st St. - San Jose 180,000
Santa Clara 1.99 CA 82 & 1st St. - San Jose California 87 - San Jose 197,000
Santa Clara 2.52 California 87 - San Jose Bird Avenue - San Jose 214,000
Santa Clara 2.88 Bird Avenue - San Jose Race Street - San Jose 228,000
Santa Clara 3.76 Race Street - San Jose Southwest Exp. - San Jose 184,000
Santa Clara 3.88 Southwest Exp. - San Jose Meridian Road - San Jose n/a
Santa Clara 3.99 Meridian Road - San Jose Leigh Avenue - San Jose n/a
Santa Clara 4.50 Leigh Avenue - San Jose Leland Avenue - San Jose 184,000
Santa Clara 4.66 Leland Avenue - San Jose I-880 & CA 17 - San Jose 197,000

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Santa Clara 5.41 Interstate 880 & California 17 - San Jose Winchester Boulevard (Santa Clara & Los Gatos Roads) - San Jose 186,000
Santa Clara 5.95 Winchester Boulevard (Santa Clara & Los Gatos Roads) - San Jose Saratoga Avenue - San Jose 206,000
Santa Clara 5.95 Saratoga Avenue - San Jose Lawrence Expwy. - San Jose 174,000
Santa Clara 7.12 Lawrence Expwy. - San Jose Stevens Creek Blvd. - S.J. 138,000
Santa Clara 7.39 Stevens Creek Blvd. - S.J. Wolfe Road - Cupertino 160,000
Santa Clara 8.38 Wolfe Road - Cupertino Sunnyvale Road & De Anza Boulevard - Cupertino 150,000
Santa Clara 9.43 Sunnyvale Road & De Anza Boulevard - Cupertino California 85 - Sunnyvale 136,000
Santa Clara 10.74 California 85 - Sunnyvale Foothill Blvd. - Cupertino 141,000
Santa Clara 11.45 Foothill Blvd. - Cupertino Magdalena Avenue 122,000
Santa Clara 14.10 Magdalena Avenue El Monte Avenue - Los Altos Hills 123,000
Santa Clara 15.05 El Monte Avenue - Los Altos Hills Page Mill Road 114,000
Santa Clara 18.38 Page Mill Road Alpine Road 110,000
Santa Clara 20.61 Alpine Road San Mateo County line (20.63) 101,000
San Mateo 0.00 Santa Clara County line Sand Hill Road 101,000
San Mateo 1.61 Sand Hill Road California 84 - Woodside 109,000
San Mateo 3.34 California 84 - Woodside Farm Hill Blvd. - Woodside 107,000
San Mateo 4.65 Farm Hill Blvd. - Woodside Canada Road 105,000
San Mateo 6.61 Canada Road Edgewood Road 106,000
San Mateo 6.65 Edgewood Road California 92 111,000
San Mateo 10.82 California 92 CA 35 - Bunker Hill Drive 108,000
San Mateo 12.32 CA 35 - Bunker Hill Drive Hayne Road 112,000
San Mateo 14.22 Hayne Road Trousdale Drive 110,000
San Mateo 17.16 Trousdale Drive Hillcrest Blvd. - Millbrae 116,000
San Mateo 17.92 Hillcrest Blvd. - Millbrae Larkspur Drive - Millbrae 110,000
San Mateo 18.52 Larkspur Drive - Millbrae CA 35 north - San Bruno 121,000
San Mateo 19.28 CA 35 north - San Bruno Whitman Way - San Bruno 105,000
San Mateo 20.22 Whitman Way - San Bruno San Bruno Ave. - San Bruno 116,000
San Mateo 20.75 San Bruno Ave. - San Bruno I-380 east - San Bruno 105,000
San Mateo 21.02 I-380 east - San Bruno Sneath Lane - San Bruno 159,000
San Mateo 21.31 Sneath Lane - San Bruno Avalon Drive - S. San Fran. 180,000
San Mateo 22.04 Avalon Drive - S. San Fran. Westborough Blvd. - S.S.F. 154,000
San Mateo 22.62 Westborough Blvd. - S.S.F. Hickey Blvd. - Daly City 189,000
San Mateo 24.20 Hickey Blvd. - Daly City Collins Avenue (Serramonte Boulevard) - Daly City 179,000
San Mateo 24.63 Collins Avenue (Serramonte Boulevard) - Daly City California 1 south - Daly City 219,000
San Mateo 25.28 California 1 south - Daly City Junipero Serra (Eastmoor Avenue) - Daly City 219,000
San Mateo 26.04 Junipero Serra (Eastmoor Avenue) - Daly City California 1 north - Daly City 223,000
San Mateo 27.17 California 1 north - Daly City San Francisco County (27.43) 141,000
San Francisco 0.00 San Mateo County line CA 82 Alemany Blvd. & San Jose Ave. - San Francisco 141,000
San Francisco 0.74 CA 82 Alemany Blvd. & San Jose Ave. - San Francisco Geneva & Ocean Avenues - San Franciso 183,000
San Francisco 1.77 Geneva & Ocean Avenues - San Franciso Monterey Boulevard & San Jose Avenue - San Francisco 191,000
San Francisco 2.70 Monterey Boulevard & San Jose Avenue - San Francisco Alemany Boulevard - San Francisco 177,000
San Francisco 3.28 Alemany Boulevard - San Francisco U.S. 101 - San Francisco 177,000
San Francisco 4.34 U.S. 101 - San Francisco Army Street - San Francisco 107,000
San Francisco 5.62 Army Street - San Francisco Indiana St. & Pennsylvania Ave. - San Francisco 86,000
San Francisco 6.05 Indiana St. & Pennsylvania Ave. - San Francisco Mariposa Street - San Francisco 98,000
San Francisco 6.60 Mariposa Street - San Francisco 4th Street - San Francisco 89,000
End Freeway (mp 7.00)
San Francisco 7.07 4th Street - San Francisco Brannan Street - San Francisco (7.54) 51,000
Source: Caltrans, Traffic Operations Program - Traffic and Vehicle Data Systems [2002]

Page Updated July 30, 2003.