Single-post, temporary sign support with sandbag ballast

Mississippi uses single u-posts for warning signs up to 36-inch and double u-posts for 48-inch warning signs. For directional signs, the state uses u-posts (from two up to however many it takes). Sometimes the state places signs or chevrons 48×60 on steel tubing frames and uses sandbags to keep these from turning over. Any of the NCHRP 350 designs would work.