The six-lane I-380 through Cedar Rapids begins/ends at the Blairs Ferry Road exit, which is partially integrated into the IA 100 volleyball interchange. However, with growth in Hiawatha, that is not sufficient for the northern part of the metro area.
A DOT meeting tonight in Hiawatha is “to evaluate improvement alternatives” for I-380 between IA 100 and County Road E34 (County Home Road). (Direct link to project statement PDF) However, the project display (PDF) goes a step further, showing three diverging diamond interchange concepts for the Boyson Road exit and then a diverging diamond and regular diamond for a new exit at Tower Terrace Road. The latter is at the tail end of the current five-year plan (2022) but expanding the mainline to six lanes would not happen until after that.