San Ysidro
San Ysidro is a neighborhood in South San Diego that is best known for its border crossing to Mexico , the San Ysidro Port of Entry .
history
Until 1957, San Ysidro was an independent city, then it was incorporated into San Diego .
The San Ysidro rampage occurred on July 18, 1984 in this part of town (21 fatalities).
traffic
The US Interstate 5 joins the Mexican Carretera Federal 1 .
A line of the San Diego tram (Blue Line) also ends here .