High Crash Risk Unsignalized Intersections
Record Type: DOT
Unsignalized intersections represent potential hazards not present at signalized intersections because of the priority of movement on the main road and significant speed difference as well as drivers' and pedestrians' perceptions. As a result, information such as traffic volume, highway geometric features and traffic control data is crucial to the crash analysis in addition to crash information. The current Arizona Department of Transportation (ADOT) program for identifying hazardous unsignalized intersections is challenged by the crash data limitation. For example, in some cases, one cannot tell from some crash records whether a crash occurred at a signalized-intersection or at an unsignalized intersection. The traditional analysis is further deteriorated by Regression-to-the-Mean (RTM) due to the random fluctuation of crash occurrence from year to year at a location. In other words, a short time period observation of a location may not provide a solid indication of the safety status of that location. The entire process is aggravated by the lack of staffing in terms of time and knowledge. Therefore, a systematic process is required to tackle all the aforementioned problems. By streamlining the process, crash data can be combined with other data sources available at MAG and other jurisdictions to improve data coverage and data quality. The EB method can be adopted to overcome the RTM. Moreover, the GIS technologies can be incorporated into the process to save staff's time in data processing. For instance, routes and crashes can be overlaid with aerial photograph to provide the engineer with a better picture of the roadway configuration of a crash site. Various tools such as spot identification and corridor analysis will enhance the engineer's ability to analyze unsignalized intersection safety problems at a project, corridor or even a network level.
Start date: 2005/9/2
Status: Terminated
Contract/Grant Number: SPR 591
Total Dollars: 50000
Source Organization: Arizona Department of Transportation
Date Added: 02/21/2006
Index Terms: Unsignalized intersections, Accident prone locations, Crash injuries, Traffic volume, Geometric design, Highway safety, Geographic information systems, Corridors, Research projects, Arizona,
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Arizona Department of Transportation
http://www.azdot.gov
206 South 17th Avenue
Phoenix, AZ 85007
USA
Federal Highway Administration
http://www.fhwa.dot.gov/
1200 New Jersey Avenue, SE
Washington, DC 20590
USA
Phone: (202) 366-4000
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Harris, Jason
Phone: (602) 712-6927
Fax: (602) 712-3400
Email: JHarris@azdot.gov
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