generate questions: The city shares a 15-mile (24 km) border with Mexico that includes two border crossings. San Diego hosts the busiest international border crossing in the world, in the San Ysidro neighborhood at the San Ysidro Port of Entry. A second, primarily commercial border crossing operates in the Otay Mesa area; it is the largest commercial crossing on the California-Baja California border and handles the third-highest volume of trucks and dollar value of trade among all United States-Mexico land crossings.
Where is San Diego's border crossing? {sep_token} How long is the border that San Diego shares with Mexico? {sep_token} What is the volumte of trucks handled at the Otay Mesa crossing? {sep_token} Where is the next nearest commercial crossing at the border? {sep_token} How many border crossings does San Diego share with Mexico? {sep_token}