• Crash Rates and Crash Densities in Iowa by Road System: 2001-2007 (, 1.2MB, 58pg.)
• Crash Rates and Crash Densities in Iowa by Road System: 1998-2007 (, 2.1MB, 82pg.)
• Average Intersection Crash Rates (from 1989) (, 13KB, 1pg.)

• 1970-2007 Historical Crash Frequencies and Rates (, 2.8MB, 10pg.)
• 2001-2007 Historical Crash Frequencies and Rates (, 845KB, 10pg.)
• 1970-2000 Historical Crash Frequencies and Rates (, 130KB, 10pg.)

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