Tijuana (or TJ as the San Diego locals refer to it), is located just 16 miles south of downtown San Diego. It may seem very quick and easy to get there, but it can be difficult to predict how long it will take to get across the border. Sometimes the lines are quite long. The recommended method for visiting Tijuana is to take the trolley from downtown San Diego to the border and then cross on foot. If you’re planning to cross the border, be sure to bring proper documentation.