 Since the Cedar Rapids bypass was completed in 1985 , on occasion , traffic has had to be rerouted off of US 30 . The bypass 's proximity to the Union Pacific Railroad mainline resulted in an elevated roadway between Edgewood Road and Sixth Street SW . When strong winds come from the south , fog produced by an Archer Daniels Midland plant adjacent to the highway billows over the road making driving dangerous . The Iowa DOT set up an emergency detour from Edgewood Road SW north to 16th Avenue SW east to 6th Street SW back to US 30 . The frequency of fog @-@ related detours has decreased in recent years due to improved technology and the plant 's expansion and relocation of cooling towers away from the highway . 
