Transportation
Personal transportation is dominated by automobiles, which operate on a network of 13 million roads,[211] including one of the world's longest highway systems.[212] The world's second largest automobile market,[213] the United States has the highest rate of per-capita vehicle ownership in the world, with 765 vehicles per 1,000 Americans.[214] About 40% of personal vehicles are vans, SUVs, or light trucks.[215] The average American adult (accounting for all drivers and nondrivers) spends 55 minutes driving every day, traveling 29 miles (47 km).[216]
Mass transit accounts for 9% of total U.S. work trips.[217][218] While transport of goods by rail is extensive, relatively few people use rail to travel,[219] though ridership on Amtrak, the national intercity passenger rail system, grew by almost 37% between 2000 and 2010.[220] Also, Light rail development has increased in recent years.[221] Bicycle usage for work commutes is minimal.[222]
The civil airline industry is entirely privately owned and has been largely deregulated since 1978, while most major airports are publicly owned. The three largest airlines in the world by passengers carried are U.S.-based; Delta Air Lines is number one.[223] Of the world's thirty busiest passenger airports, sixteen are in the United States, including the busiest, Hartsfield-Jackson Atlanta International Airport.[
