CTRE is an Iowa State University center, administered by the Institute for Transportation.

Address: 2711 S. Loop Drive, Suite 4700, Ames, IA 50010-8664

Phone: 515-294-8103
FAX: 515-294-0467

Website: www.ctre.iastate.edu/

Iowa State University--Becoming the Best

Development of a Conflict Analysis Methodology Using SSAM


Principal investigators:

Co-principal investigator:

Student researcher:

Project status


Start date: 01/01/10
End date: 12/31/11


Report: Development of a Conflict Analysis Methodology Using SSAM (2.73 mb pdf) September 2012



About the research


The ultimate goal of this research was to provide improved design guidance for J-turn intersections by learning more about the safety and operational consequences of including or excluding certain geometric design features under various traffic volume conditions.

The proposed methodology to accomplish this research objective was to use the VisSim micro-simulation software package in conjunction with Federal Highway Administration (FHWA) Surrogate Safety Assessment Model (SSAM).

Three alternative high-speed rural expressway intersection designs were modeled previously in VisSim and used to accomplish this analysis. This report examines the use of SSAM for performing a conflict analysis, comparing the safety consequences of alternative designs, and developing conflict and/or crash modification factors. A conflict analysis methodology using the SSAM software was developed and refined. The refined conflict analysis methodology is included in this report.