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-Alternative 1 is four new, divided lanes north of the current route. The present E66 junction is changed to R Avenue for access to E66 in all three alternates.
Alternate 1 is the route preferred by the Iowa Department of transportation engineers. This route would allow traffic to flow on the present roadway while all construction takes place to the north.
-Alternate 2 adds lanes to the present alignment.
-Alternate 3- is four new, divided lanes south of the present alignment.
Iowa Department of Transportation maps