Most of the US cities I've lived in have poorly laid out bus systems; Seattle is a notable exception with plenty of cross-town and downtown routes, and riders are never more than a couple blocks from the nearest stop.
Most cities are laid out in a hub and spoke system, pulling from suburbs into downtown, but most employers are in office parks in a ring outside the downtown area. A public transit commute may mean nearly an hour into downtown, than another hour to the suburbs, followed by a long walk. In other cities, public transit is only available at certain hours: my parents, for instance, can only catch a bus to work before 7 AM and then won't have a bus back home until after 5 or 6 PM.
Most cities are laid out in a hub and spoke system, pulling from suburbs into downtown, but most employers are in office parks in a ring outside the downtown area. A public transit commute may mean nearly an hour into downtown, than another hour to the suburbs, followed by a long walk. In other cities, public transit is only available at certain hours: my parents, for instance, can only catch a bus to work before 7 AM and then won't have a bus back home until after 5 or 6 PM.