USA Banner
  U.S. flag
              An official website of the United States government Here's how you knowOfficial US Government Icon
              **Official websites use .gov**A **.gov** website belongs to an official government organization in the United States.
            Secure Site Icon
              **Secure .gov websites use HTTPS**
                  A **lock** ( A locked padlock ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. 
 U.S. Department of Transportation Icon United States Department of Transportation
 Search DOT
            Search
                    About FHWAFHWA Organization
                Headquarters Offices
                Field Offices
                Strategic Plan
                Business Opportunities
                Staff Directories
                Careers
                Highway History
                Contact UsProgramsAcquisition Management
                Civil Rights
                Federal Lands Highway
                Infrastructure
                Innovative Program Delivery
                Operations
                Planning, Environment, and Realty
                Policy
                Research, Development, and Technology
                Safety
                Browse by TopicsResourcesCore Highway Topics
                Federal Aid Essentials
                Automation
                Complete Streets
                Laws and Regulations
                Policy & Guidance Center
                Section 508
                Publications and Statistics
                Professional Development
                National Highway Institute
                Resource Center
                Accessibility Resource Library
                FHWA Research LibraryNewsroomPress Releases
                Speeches & Testimony
                Photos
                Videos
                Media ContactsMenu FHWA Highway Safety Programs Home
                        Tribal Road Safety Audits: Case Studies


            
            In This Section
        Safety Data Analysis & Tools
                Crash Modification Factor Clearinghouse
                Roadway Safety Data Program (RSDP)
                                Overview
                Data Driven Safety Analysis
                Data Management
                Safety Data Analysis Tools
                Local Data Integration
                Technical Assistance
                Case Studies
                Training
                Resources
                Highway Safety Manual (HSM)
                Model Inventory of Roadway Elements (MIRE) and FDEs
                Systemic
                                Overview
                Why Systemic
                Training
                Resources
                Road Safety Audits
                                Overview
                Benefits
                Legal Issues
                Steps of Conduct
                Training
                Resources
                
                RSAs: COSTS AND BENEFITS
RSA Costs

Three main factors contribute to the cost of an RSA:

RSA team costs.
	Design team and owner costs.
	Costs of design changes or enhancements.The *RSA team* costs reflect the size of the team and the time required for the RSA, which in turn are dependent on the complexity of the RSA project. For the RSAs in this case studies project, the following cost components are noted:

RSA teams were composed of between five and ten persons in this case studies project, but these teams were large since the RSAs served as training exercises for tribal and state engineering staff. Without the need for training, the RSA teams would more typically have been composed of three persons.
	Opening and closing meetings, site visits, and RSA analysis sessions were conducted in a three-day period for each RSA.
	Prior to and following the on-site portion of the RSA, the time required for analysis (such as analysis of collision records, and research on applicable design standards or mitigation measures) and writing the RSA report ranged between about 30 to 40 man-hours.For this case studies project, additional RSA team costs were incurred in travel for experienced RSA team leaders. However, typical RSAs would employ local team members, and consequently entail only minor travel costs.

The *design team and owner costs* reflect the time required for staff to attend the start-up and preliminary findings meetings, and to subsequently read the RSA report and respond to its findings. In addition, staff time is required to compile project or site materials for the RSA team.

The final cost component is that resulting from design changes or enhancements, which reflect the number and complexity of the issues identified during the RSA. Suggested

design changes and enhancements, listed in the Appendix (Tables A.1 through A.4) for each of the RSAs conducted for this case studies project, have focused on low-cost improvements or countermeasures where possible. Suggested improvements for the RSAs focused on improved signing and pavement markings, minor or moderate geometric changes (such as added auxiliary lanes at intersections), gateway treatments, and barrier improvements.

RSA Benefits

The primary benefits of RSAs are to be found in reduced crash costs as road safety is improved. The costs of automotive crashes are estimated by the US Department of Transportation1 as:

$3,000,000 for a traffic fatality.
	$2,290,000 for a critical injury.
	$565,000 for a severe injury.
	$175,000 for a serious injury.
	$45,000 for a moderate injury.
	$6,000 for a minor injury.Other benefits of RSAs include reduced life-cycle project costs as crashes are reduced, and the development of good safety engineering and design practices, including integration of multimodal safety concerns and consideration of human factors in the design, operations, and maintenance of roads.

It is difficult to quantify the benefits of design-stage RSAs, since they aim to prevent crashes from occurring on new or improved facilities that have no crash record. However, when compared with the high cost of motor-vehicle injuries discussed above, the moderate cost of a design-stage RSA suggests that changes implemented from an RSA only need to prevent a few moderate- or high-severity crashes for an RSA to be cost effective.

The benefits of RSAs on existing roads can be more easily quantified, since pre-and post-improvement collision histories are available. As an example, the Road Improvement Demonstration Project conducted by AAA Michigan in Detroit and Grand Rapids (MI), which is based on RSAs of existing high-crash urban intersections and implementation of low-cost safety measures at them, has demonstrated a benefit-cost ratio of 16:1. Another example of data on the quantitative safety benefit of RSAs conducted on existing roads comes from the New York DOT, which reports a 20 to 40 percent reduction in crashes at more than 300 high-crash locations that had received surface improvements and had been treated with other low-cost safety improvements suggested by RSAs.

The South Carolina DOT RSA program has reported a positive impact on safety. Early results from four separate RSAs, following one year of results, are promising. One site, implementing four of eight suggested improvements, saw total crashes decrease 12.5 percent, resulting in an economic savings of $40,000. A second site had a 15.8 percent increase in crashes after only two of the thirteen suggestions for improvements were incorporated. A third site, implementing all nine suggested improvements, saw a reduction of 60 percent in fatalities, resulting in an economic savings of $3,660,000. Finally, a fourth location, implementing 25 of the 37 suggested safety improvements, had a 23.4 percent reduction in crashes, resulting in an economic savings of $147,000.

The most objective and most often-cited study of the benefits of RSAs, conducted in Surrey County, United Kingdom, compared fatal and injury crash reductions at 19 audited highway projects to those at 19 highway projects for which RSAs were not conducted. It found that, while the average yearly fatal and injury crash frequency at the RSA sites had dropped by 1.25 crashes per year (an average reduction from 2.08 to 0.83 crashes per year), the average yearly fatal and injury crash frequency at the sites that were not audited had dropped by only 0.26 crashes per year (an average reduction from 2.6 to 2.34 crashes per year). This suggests that RSAs of highway projects make them almost five times more effective in reducing fatal and injury crashes.

Other major studies from the United Kingdom, Denmark, New Zealand, and Jordan quantify the benefits of RSAs in different ways. However, all report that RSAs are relatively inexpensive to conduct and are highly cost effective in identifying safety enhancements.
      
  Book traversal links for RSAs: COSTS AND BENEFITS
      ‹ THE RSA PROCESS
                    Up
                    Chapter 3–Coordinating with Internal and External Partners ›
                
                Book:Tribal Road Safety Audits: Case Studies
              Acronyms
                EXECUTIVE SUMMARY
                INTRODUCTION
                THE RSA PROCESS
                RSAs: COSTS AND BENEFITS
                Chapter 3–Coordinating with Internal and External Partners
                THE FHWA CASE STUDIES: PROMOTING THE ACCEPTANCE OF RSAs
                CONCLUSION
                APPENDIX A
                Chapter 5–Making Data-Driven Safety Decisions
                Chapter 7–Addressing Local Road Needs
                Chapter 8–Considering all "4E's"
                Chapter 9–Identifying Opportunities to Streamline Project Delivery
                Appendix A–Key Contacts from Host States
                Appendix B–Scan Team Members
                Appendix C–Notable Practices by State U.S. DEPARTMENT OF TRANSPORTATION

**Federal Highway Administration**

1200 NEW JERSEY AVENUE, SE

WASHINGTON, DC 20590

202-366-4000Subscribe to email updates
                    About
  

        
              About FHWA
                Careers
                Org Chart
                Staff Directories
                Work with UsPrograms
  

        
              Acquisition Management
                Civil Rights
                Federal Lands Highway
                Infrastructure
                Innovative Program Delivery
                Operations
                Planning, Environment, and Realty
                Policy
                Research, Development, and Technology
                SafetyPolicies, Rights, Legal
  

        
              About DOT
                Accessibility
                Budget and Performance
                Civil Rights
                FOIA
                Information Quality
                No FEAR Act
                Office of Inspector General
                Privacy Policy
                USA.gov
                Web Policies and Notices
                Web StandardsNews & Events
  

        
              Newsroom
                Press Releases
                Speeches & Testimony
                Media Contacts
                Connect with Us