Visitors traveling by air can use facilities at the Philadelphia International Airport or Newark International Airport, each about an hour's drive from Trenton. Both airports offer complete domestic and international service. Commuter plane and helicopter traffic is routed to Mercer County Airport in nearby Ewing Township, where Pan Am Airlines offers its services. New Jersey Transit, a transportation system unique in the nation, allows passengers to purchase tickets anywhere in the state, and board a train or bus to travel to any destination in the state. Amtrak schedules many daily trips to and from Boston and Washington, D.C., while Southeastern Pennsylvania Transportation Authority (SEPTA) provides daily service to Philadelphia.
Trenton lies at the heart of an extensive and heavily used network of roads. Interstate-95 passes around the city to the north while I-295 circles the eastern portion of the city and I-195 splits off toward the East Coast. Trenton is located along U.S. Route 1, which diagonally bisects the city, running northeast-southwest. Route 1 is one of the busiest in the state. U.S. Route 206 runs through the center city. U.S. Route 129 links to Route 1, I-195 and 295. The Trenton Highway complex links Route 1 and Route 29 to I-195 and I-295.
Trenton experiences moderate traffic during rush hours downtown. Major east-west thoroughfares include the John Fitch Parkway and Olden Avenue Extension while north-south arteries include Calhoun Street and Princeton Avenue. An extensive bus system services Trenton and Mercer County. Each year, the public bus system in New Jersey transports millions of passengers, many of them commuters from the Trenton area.