 As I @-@ 80 enters the Iowa City area , the speed limit drops to 65 mph ( 105 km / h ) . On the edge of Coralville is an interchange with US 218 and Iowa 27 . This interchange is also the beginning of I @-@ 380 , which heads north along US 218 and Iowa 27 towards Cedar Rapids and Waterloo . The I @-@ 80 / I @-@ 380 interchange was identified as the most likely location in Iowa for a semi @-@ trailer truck to overturn . According to the American Transportation Research Institute , 30 trucks rolled over at the interchange during the 8 @-@ year study period . The Iowa DOT has plans to replace the cloverleaf interchange with a turbine interchange , but the project would not take place until around 2025 . 
