Columbia subject headings:
Harvard subject headings:
Federal aid to transportation--United States.
Highway law--United States.
Roads--Finance--Law and legislation--United States
Transportation--Finance--Law and legislation--United States
Transportation--Research--United States
Princeton subject headings:
Federal aid to transportation--United States.
Highway law--United States.
Roads--Finance--Law and legislation--United States.
Transportation--Finance--Law and legislation--United States.
Transportation--Research--United States.