With the automobile being the primary means of transportation for over 80% of its residents, San Diego is served by an extensive network of freeways and highways. This includes Interstate 5, which runs south to Tijuana and runs north to the Canadian border through Orange County, Los Angeles, Sacramento, Portland, and Seattle; I-8, which runs east to Imperial County and Arizona; I-15, which runs north to the Canadian border through Riverside County and Salt Lake City; and I-805, which splits from I-5 at Sorrento Valley and rejoins I-5 near the Mexican border. Notable state highways are SR 94, which connects downtown with I-805, I-15 and east county; SR 163, which connects downtown with the northeast part of the city, intersects I-805 and merges with I-15 at Miramar; SR 52, which connects La Jolla with east county through Santee and SR 125; SR 56, which connects I-5 with I-15 through Carmel Valley and Rancho Peñasquitos; and SR 75 (San Diego-Coronado Bridge), which spans San Diego Bay.
Several regional transportation projects have been undertaken in recent years to deal with congestion on San Diego freeways. This includes expansion of Interstates 5 and 805 around "The Merge," a rush-hour spot where the two freeways meet. Also, an expansion of Interstate 15 through the North County is underway with the addition of high-occupancy-vehicle (HOV) "managed lanes". There is a tollway (The South Bay Expressway) connecting SR 54 and Otay Mesa, near the Mexican border. According to a 2007 assessment, 37% of streets in San Diego were in acceptable driving condition. The proposed budget fell $84.6 million short of bringing the city's streets to an acceptable level.
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