Freeways and highways
As the automobile is the primary means of transportation for the region, the greater San Diego area is served by an extensive network of freeways and highways. This includes Interstates 5, which runs north to Orange County and south to Mexico; 8, which runs east to Imperial County and Arizona; 15, which runs north to Riverside County; and 805, which splits from I-5 at Sorrento Valley and rejoins it before the Mexican border. Notable state highways are the 54 in the South Bay; the 125, 94, and 67 in the East County; the 56 and 78 in the North County; the 52 (La Jolla-Santee); and the 163 (Downtown-Miramar). The San Diego-Coronado Bridge, which spans San Diego Bay, is signed as part of California State Route 75.
Several regional transportation projects have been undertaken in recent years to deal with increasing congestion problems on San Diego freeways. This includes a massive expansion of Interstates 5 and 805 around "The Merge," a notorious rush-hour spot where the two freeways meet. Also, an expansion of Interstate 15 through the North County is underway with the concept of high-occupancy-vehicle (HOV) "managed lanes" in the freeway median. A tollway (The South Bay Expressway) linking State Route 54 and Otay Mesa, near the Mexican border, is also under construction and is expected to open in 2007.
(Source: Wikipedia.org)
