With the automobile being the primary means of transportation for over 80 percent of its residents, San Diego is served by a network of freeways and highways. This includes Interstate 5, which runs south to Tijuana and north to Los Angeles; Interstate 8, which runs east to Imperial County and the Arizona Sun Corridor; Interstate 15, which runs northeast through the Inland Empire to Las Vegas and Salt Lake City; and Interstate 805, which splits from I-5 near the Mexican border and rejoins I-5 at Sorrento Valley.
What major interstate runs from Tijuana to Los Angeles? Where does Interstate 805 split from I-5? Which interstate directly connects the east with the Arizona Sun Corridor and Imperial County? What two major cities are Inland Empire connected to via Interstate 15? What percentage of San Diego's residents rely on theri automobile as a primary source of transportation?