Prior to the #primaryHighwaySystem which exists in the #USState of Iowa today, signed highway routes known as #autoTrails were registered with the #IowaStateHighwayCommission. Organizations, such as the #LincolnHighwayAssociation, volunteered to sponsor and register certain roads with the highway commission. Each organization chose their colors and designed route markers to guide motorists along the way. Eventually, confusion reigned and the highway commission took action. Beginning in 1920.