Development of a Conflict Analysis Methodology Using SSAM

Project status


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


Principal investigators:

Co-principal investigator:

Student researcher:

  • Joshua Hochstein

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.


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



  • Iowa Department of Transportation
  • Midwest Transportation Consortium