 The proposed highway was to run from Illinois Route 80 near Port Byron, Illinois, which ran along the eastern bank of the Mississippi River, over a new bridge into Iowa, to the South Omaha Bridge where US 275 crossed the Missouri River. The entire route was to be in close proximity to US 6 across the state. It was to be the first modern four-lane highway in the state, with 12-foot-wide (3.7 m) lanes and an at least 15-foot-wide (4.6 m) grassy median. Sixteen interchanges were planned along the route. Most interchanges were to be located near population centers; an option to build a seventeenth near Grinnell, if necessary, was included. Eight service areas, similar in quality to those found on the Pennsylvania and New Jersey turnpikes, were planned as well.
