As a transportation engineer, I find jumbopackage's argument not uncommon in your average layperson. Planning isn't my area, he'd be best served to contact a DOT transportation engineer or planner working with infrastructure needs.
People forget or aren't aware of basic principles (among many: structural need, construction/maintenance costs, and most importantly
user costs which are enormous when taken as a whole and involve everything from impact on the actual vehicle, fuel, displacement costs due to path interruption/diversion, and myriad other things).
This major corridor planning isn't just done without planning and concern for the economy and welfare of the state of Iowa and its communities.
If it's really important to you, contact the DOT. They're more than happy to answer questions and concerns.
Highway - Iowa Department of Transportation