About San Ysidro :

San Ysidro is located where Interstate 5 crosses into Tijuana, Mexico and is home to the world’s busiest land border crossings. In 2005 there were more than 17 million vehicles and 50 million people entered the United States at the San Ysidro port of entry. The majority of the people crossing are workers that commute from Tijuana to their jobs in San Diego and throughout southern California.