 If traffic levels were not high enough to raise enough revenue, as the opponents of the project worried, the state would end up paying for the project, thus defeating the purpose of a toll road.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.It would then span across the state to the South Omaha Bridge where US 275 crossed the Missouri River.