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. In addition, more than half the states in the nation have adopted 511 as an all-purpose local-transportation help line.
Shuttle buses provide inexpensive and convenient transport to/from airports in most cities. Most are 12-seat vans; some have regular routes and stops (which include the main hotels) and some pick up and deliver passengers 'door to door' in their service area. Costs range from $15 to $30 per person.
Some cities are more amenable to bicycles than others, but most have at least a few dedicated bike lanes and paths, and bikes can usually be carried on public transportation.
Most cities and larger towns have dependable local bus systems, though they are often designed for commuters and provide limited service in the evening and on weekends. Costs range from free to between $1 and $3 per ride.
The largest systems are in New York, Chicago, Boston, Philadelphia, Washington, DC, Chicago, Los Angeles and the San Francisco Bay Area. Other cities may have small, one- or two-line rail systems that mainly serve downtown.
Taxis are metered, with flagfall charges of around $2.50 to start, plus $2 to $3 per mile. They charge extra for waiting and handling baggage, and drivers expect a 10% to 15% tip. Taxis cruise the busiest areas in large cities; otherwise, it's easiest to phone and order one.
Hitchhiking in the USA is potentially dangerous and definitely not recommended. Indeed, drivers have heard so many lurid reports they tend to be just as afraid of those with their thumbs out. Hitchhiking on freeways is prohibited. You'll see more people hitchhiking in rural areas and in Alaska and Hawaii, but these places aren't safer than anywhere else, and with sparse traffic, you may well get stranded. In and around national parks, hitching to and from trailheads is common, but a safer bet is to check ride-share boards at hostels, park visitor centers and wilderness information stations.