- SAN DIEGO DEMOGRAPHICS University of California, San Diego Transportation About two thirds (67%) of the region's 1.2 million workers leave for work between 6:00am and 9:00am. Of those, 76 percent drive alone. The graphic depicts, by area, the proportion of workers during the morning commute that drive alone, carpool, and use public transit or other means to get to work. The size of the pie chart ...gort.ucsd.edu/mw/sdlocl.html