The Iowa Dept. of Transportation reports placement of an overhead sign truss near Interstate 29 in Sioux City will require closures of the southbound frontage road between Pierce Street and Floyd Boulevard between 11 a.m. and 1 p.m. Thursday, Oct. 12, weather permitting. Traffic will be stopped for 20-minute intervals. Motorists approaching this area should drive with caution and be prepared to stop for traffic backups beyond the limits of the work zone.