In April 1960 President Eisenhower was shown a book of maps and discovered, with visible anger, where his interstate highways were going. The book had been printed five years earlier and sent to every member of Congress. The episode traces how engineers set urban routing doctrine in public reports from 1939 on, and Congress ratified it by silence.
Claims that Congress approved the Yellow Book are false; the 1956 act enacted no route maps. The 1960 memorandum documents Eisenhower's displeasure but does not establish he had never been told. The maps showed general corridors; states drew actual alignments.



