The objective of this project is to develop tools and procedures by which Iowa engineers can identify potentially hazardous roadway locations and designs, and to demonstrate the utility of these tools by developing candidate lists of high crash locations in the State. An initial task, building an integrated database to facilitate the tools and procedures, is an important product, in and of itself. Accordingly, the Iowa Department of Transportation (Iowa DOT) Geographic Information Management System (GIMS) and Geographic Information System Accident Analysis and Location System (GIS-ALAS) databases were integrated with available digital imagery. (The GIMS database contains roadway characteristics, e.g., lane width, surface and shoulder type, and traffic volume, for all public roadways. GIS-ALAS records include data, e.g., vehicles, drivers, roadway conditions, and the crash severity, for crashes occurring on public roadways during then past 10 years.) Procedure Using the GIMS and GIS-ALAS databases, high crash locations and relationships between crash rates and selected roadway design characteristics were identified. Based on input from county, state and consulting engineers, the project studied five crash types: (1) crashes on horizontal curves, (2) fixed-object crashes, (3) rural four-lane expressway intersection crashes, (4) head-on crashes (due to crossing the centerline), and (5) urban four-lane undivided corridor crashes.


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