An estimated 5.2% of American workers commute on public transit. Larger, denser cities often require comprehensive public transportation systems that can reduce residents’ dependence on automobiles and help decrease traffic congestion, air pollution, and in some cases, travel time. In the San Diego-Carlsbad metro area, 3.5% of workers commute on public transit, smaller than the national share and fifth highest in the state.

One indication of a good transit system is an economically diverse ridership. In San Diego, the typical public transit commuter earns $20,763 a year, roughly 54% of the $38,437 median earnings of commuters who drive to work alone in the metro area. Nationwide, the median earnings of public transit commuters is 89% of the earnings of workers who drive alone to work.

There are a number of benefits to public transportation. Riders save money, get more physical activity, and, on some routes, may even save time. On average, those who take public transit in San Diego take 25 minutes longer getting to work than those who drive. Nationwide, taking public transit adds 25 minutes to the average commute.

In the city of San Diego, the largest urbanized area in the San Diego-Carlsbad metro, the San Diego Metropolitan Transit System runs public transportation. In total, the MTS handles 91.9 million passenger trips per year, making it one of the larger public transit agencies nationwide. The average resident of the city travels 143 miles and takes 31 trips on public transit a year, making the San Diego public transportation system one of the largest and most utilized in the country.