The Greater Des Moines area is located at the crossroads of Interstates 80 and 35, making it one of the few metro areas that sit at the intersection of major highways running from coast to coast and border to border. In addition, the area is served by the Des Moines International Airport (DSM) and four general aviation airports, 58 motor freight carriers, local and regional bus service and several railroads. The area also has a US Port of Entry and Foreign Trade Zone.