Utility Safety in Work Zones - Iowa Department of Transportation 1999 - Video VH-601 - Highway Work Zone Safety. Federal Highway of Administration and the Iowa Department of Transportation. This program shows the above and below ground hazards of telecommunications, electric, gas, water and sewer utilities; the on-site consequences when they are disrupted; and the off-site consequences to those affected by disruptions. Emphasis is on contacting the One Call system to locate underground utility hazards before beginning any work. With footage from operating work zones, good safety practices, actual safety hazards and unsafe working conditions and procedures are illustrated.