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                        Road Safety Audit Case Studies: Using IHSDM in the RSA Process


            
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                Eight Steps of an RSA
The eight steps of an RSA are shown in Figure 1 and follow the procedures outlined in the FHWA *Road Safety Audit Guidelines* document (Publication Number FHWA-SA-06-06).

The **RSA Projects**were pre-selected for this case studies project and the **RSA teams**were interdisciplinary, typically including engineering, planning, enforcement staff (Steps 1 and 2) from various levels of government to include Federal, State, municipal, and metropolitan planning organizations (MPO).

All meetings and site visits for the RSAs in the case studies project were conducted over two or three day periods. The RSAs typically began with a start-up meeting (Step 3) attended by the Project Owner and/or Design Team (hereafter referred to as the Owner), and the RSA team:

The Owner described concerns regarding the roads and intersections to be assessed, why the sites had been chosen for an RSA, and any constraints or limitations. Typically, the reasons for the RSA site selection centered on high-profile crashes or public safety concerns.
	The multidisciplinary RSA Team then described the RSA process. This included an overview of the RSA process with examples of safety issues that are typically encountered and mitigation measures to address them.
	Additional issues, such as planned roadway improvements, can be discussed during this step.Following the start-up meeting and a preliminary review of the design or site documentation, the RSA Team conducted a **field review**(Step 4). The purpose of the field review was to observe the ambient conditions in which the proposed design would operate (for the planning-stage RSA), or to observe geometric and operating conditions (for the RSAs of existing roads). The RSA Team observed site characteristics (such as road geometry, sight distances, clear zones, drainage, signing, lighting, and barriers), traffic characteristics (such as typical speeds and traffic mix), surrounding land uses (including traffic and pedestrian generators), and link points to the adjacent transportation network. Human factors issues were also considered by the RSA team, including road and intersection "read-ability," sign location and sequencing, and older-driver limitations. Field reviews were conducted by the RSA Team under a variety of environmental conditions (such as daytime and night-time) and operational conditions (such as peak and off-peak times).

The team conducted the RSA analysis (Step 5) in a setting in which all team members reviewed available background information (such as traffic volumes and collision data) in light of the observations made in the field. On the basis of this review, the RSA Team identified and prioritized safety issues, including features that could contribute to a higher frequency and/or severity of crashes. For each safety issue, the RSA Team generated a list of possible measures to mitigate the crash potential and/ or severity of a potential crash.

At the end of the analysis session, the Owner and the RSA Team reconvened for a preliminary findings meeting (Step 6). Presenting the preliminary findings verbally in a meeting gave the Owner the opportunity to ask questions and seek clarification on the RSA findings, and also provided a useful forum for the Owner to suggest additional or alternative mitigation measures in conjunction with the RSA team. The discussion provided practical information that was subsequently used to write the RSA report.

In the weeks following the on-site portion of the RSA, the RSA Team wrote and issued the RSA report (also part of Step 6) to the Owner documenting the results of the RSA. The main content of the RSA report was a prioritized listing and description of the safety issues identified (illustrated using photographs taken during the site visit), with suggestions for improvements.

The Owner was encouraged to write a brief response letter (Step 7) containing a point-by-point response to each of the safety issues identified in the RSA report. The response letter identifies the action(s) to be taken, or explains why no action would have been taken. The formal response letter is an important "closure" document for the RSA. As a final step, the Owner was encouraged to use the RSA findings to identify and implement safety improvements when policy, manpower, and funding permit (Step 8).
      
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                Book:Road Safety Audit Case Studies: Using IHSDM in the RSA Process
              Executive Summary
                Background
                Eight Steps of an RSA
                RSAs: Benefits and Costs
                Purpose
                IHSDM Overview
                Using IHSDM in the RSA Process
                Utilizing IHSDM Results
                Conclusions and Recommendations
                References
                APPENDIX A: RSA CASE STUDY DETAILS: RSA No. 1 – Snake Hill Road, Glocester, Rhode Island
                APPENDIX A: RSA CASE STUDY DETAILS: RSA No. 2 – US Highway 2, Kalispell, Montana
                APPENDIX A: RSA CASE STUDY DETAILS: RSA No. 3 – US 97, Klamath County, Oregon
                APPENDIX B: IHSDM DATA REQUIREMENTS AND ANAYSIS METHODOLOGY U.S. DEPARTMENT OF TRANSPORTATION

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