Except in large US cities, public transportation is rarely the most convenient option for travelers, and coverage can be sparse to outlying towns and suburbs. However, it is usually cheap, safe and reliable.
More than two-thirds of the states in the nation have adopted 511 as an all-purpose local-transportation help line.
The largest systems are in New York City, Chicago, Boston, Washington, DC, the San Francisco Bay Area, Philadelphia, Los Angeles and Atlanta. Other cities have small, one- or two-line rail systems that mainly serve downtown areas.