Columbia subject headings:
Freight and freightage--United States.
Highway capacity--United States.
Shipment of goods--United States.
Traffic congestion--Economic aspects--United States.
Harvard subject headings:
Freight and freightage--United States
Highway capacity--United States.
Shipment of goods--United States.
Traffic congestion--Economic aspects--United States.
Princeton subject headings:
Freight and freightage--United States.
Highway capacity--United States.
Shipment of goods--United States.
Traffic congestion--Economic aspects--United States.