There was an article in the April 22nd Wichita Eagle about the 50th anniversary of the interstates in Kansas. An eight mile section of I-70 between Valencia and Maple Hill roads west of Topeka was the first in the US to be completed, five months after the Federal Highway Act of 1956 became law.
The article went into a lot of detail about the planned motor convoy which will be retracing, in reverse, Col. Eisenhower's historic 1919 trip across the US on Lincoln Highway. This showed how bad our road system was. It will be in Eisenhower's hometown of Abilene, Kansas, June 21st to 23rd. Quite a few festivities are planned in his honor.
The article also went into some detail on why Missouri and Pennsylvania also claim to be the first with interstates. I have actually seen signs on I-70 by St. Charles, Mo., claiming that this is the first interstate. Pennsylvania bases its claim on the 1940 Pennsylvania Turnpike.
Check it out:
http://www.kansas.com/mld/kansas/14403452.htm
Keep on Down that Four Lane (or more) Interstate. --RoadDog