I want to know the answer to the following question:
How long is the border that San Diego shares with Mexico?
All the background I'm provided with is that "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.". Is that enough to answer the question?