MASON CITY, Iowa – Nov. 17, 2022 – Changes to traffic patterns will occur at the intersection of U.S. 18/U.S. 218/Iowa 27 at Floyd County Road T-44 south of Floyd on Tuesday, Nov. 22, weather permitting, according to the Iowa Department of Transportation’s Mason City construction office. Traffic pattern changes Eastbound traffic on U.S. 18/Iowa 27 currently in a head-to-head traffic pattern will be moved to the newly constructed lanes and will use the on/off ramps for access to northbound.