On average there are 900 fatalities per year in roadway work zones in the United
States (Iowa DOT, 2008a). In Iowa, there are an average of 6.5 deaths per year, 136 injury
crashes, and 224 property damage only crashes, for an average total of 366 total work zone
crashes per year. Ninety percent of Iowa work zone fatalities are motorists (Iowa DOT,
2008a).