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.
Systematic Identification of High Crash Locations
2001
143 pages
Report
No indication
English
Transportation , Transportation & Traffic Planning , Transportation Safety , Road Transportation , Accident location , Iowa , Accident rates , Literature review , Accident causes , Accident prevention , Highway safety , Hazards , Rural highways , Head on collisions , Centerline crossover collisions , Highway accident potential , Four lane highways , Roadside hazards , Statistical data , CD-ROM , GIMS database , GIS-ALAS database , GIMS(Geographic Information Management System) , GIS-ALAS(Geographic Information System Accident Analysis and Location System) , Horizontal curve accidents
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