Federal Highway Administration, America's Highways 1776–1976: A History of the Federal-Aid Program (1977)
“ Out of all our past efforts—planning, designing, constructing, bridge building, and organizational efforts at all levels of government—has come a superb system of highways to serve a growing Nation. The challenge now and in the future is to preserve and enhance the performance level of our highways and at the same time promote within a multi-modal transportation family a more flexible and innovative transportation system. ”
