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Federal Highway Administration
Office of Safety
FHWA-SA-14-073
August 2014
This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document. This report does not constitute a standard, specification, or regulation. The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers’ names may appear in this report only because they are considered essential to the objective of the document.
The Federal Highway Administration (FHWA) provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes for continuous quality improvement.
1. Report No. FHWA-SA-14-073 |
2. Government Accession No. |
3. Recipient’s Catalog No. |
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4. Title and Subtitle Improving Safety on Rural Local and Tribal Roads |
5. Report Date August 2014 |
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| 6. Performing Organization Code | ||||||
7. Author(s) Elizabeth Wemple, P.E., Timothy Colling, P.E. |
8. Performing Organization Report No. |
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9. Performing Organization Name and Address Cambridge Systematics, Inc. Michigan Technological University |
10. Work Unit No. (TRAIS) |
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11. Contract or Grant No. DTFH61-12-C-00034 |
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12. Sponsoring Agency Name and Address Department of Transportation |
13. Type of Report and Period Covered Covered Technical Manual |
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14. Sponsoring Agency Code |
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15. Supplementary Notes Federal Highway Administration (FHWA) Technical Manager: Rosemarie Anderson, Office of Safety Technical working group members: Craig Allred (FHWA Resource Center), Galen Balster (Federal Lands Highway), Dave Brand (Madison County, Ohio), Victoria Brinkly (Western Federal Lands Highway), Steve Castleberry (Nevada County, California), Clayton Chen (FHWA Research, Development, and Technology), Scott Davis (Thurston County, Washington), Kayloe Dawson (Chehalis Tribe), Thomas S. Elliot (FHWA) National Highway Institute), Tony Giancola (Roadway Safety Foundation), Daniel Holt (Federal Lands Highway), Hillary Isebrands (FHWA Resource Center), Robin Lewis (City of Bend, Oregon), Nate Miller (Upper Valley Lake Sunapee Regional Planning Commission), Todd Morrison (Kentucky LTAP), Scott Nodes (Arizona DOT), Jessica Rich (FHWA Tennessee Division), Karen Timpone (FHWA Office of Safety), Dennis Trusty (Northern Plains TTAP) |
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16. Abstract This User Guide presents an example of how rural local and Tribal practitioners can study conditions at a preselected site. It demonstrates the step-by-step safety analysis process presented in Improving Safety on Rural Local and Tribal Roads – Safety Toolkit (Publication FHWA-SA-14-072). The FHWA created the Toolkit and two User Guides to assist local agency and Tribal practitioners in completing traffic safety analyses. Each Toolkit step contains a set of tools, examples, and links to resources appropriate to the needs of safety practitioners. The User Guides accompanying the Toolkit provide hypothetical yet typical local or Tribal agency safety analysis scenarios and step-by-step solutions to the scenarios using materials from the Toolkit. This report specifically addresses how to study crash conditions at a curve on a rural roadway. The User Guide provides example applications of five Toolkit steps: compile data; diagnose site conditions and identify countermeasures; prioritize countermeasures for implementation; implement countermeasures; and evaluate effectiveness of implemented countermeasures. |
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17. Key Words Safety analysis, local roads, Tribal roads, safety management, network screening, site diagnosis, countermeasure selection, safety evaluation |
18. Distribution Statement No restrictions |
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19. Security Classif. (of this report) Unclassified |
20. Security Classif. (of this page) Unclassified |
21. No. of Pages 40 |
22. Price N/A |
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Step 4. Diagnose Site Crash Conditions and Identify Countermeasures
Step 5. Prioritize Countermeasures for Implementation
Step 6. Implement the Countermeasures
Step 7. Evaluate Effectiveness of Implemented Countermeasures
4.0 Options for Additional Activities
Table 1. Quantitative Information for Studying Safety at a Site
Table 2. Summary of Crash Data by Year
Table 3. Summary of Crash Data by Crash Type
Table 4. Summary of Site Inspection Prompt List
Table 5. CMFs of Potential Treatments
Table 6. Qualitative Comparison of Potential Treatments
Table 7. MUTCD Chevron Sign Spacing Based on Advisory Speed and Curve Radius
Table 8. Example of Comparison of Before-and-After Period Crash Data
Figure 1. Toolkit Safety Analysis Process
Figure 2. Scenario Preselected Site
Figure 3. Example Crash Form from Michigan (UD 10 Form)
Figure 4. Example Key for Crash Form from Michigan (UD 10 Form)
Figure 5. Example Site Conditions Map
Figure 6. Incapacitating Injury Crashes
Figure 7. CMF Clearinghouse Countermeasure Example Install Chevrons
Figure 8. Potential Treatment Enhanced Signage
Figure 9. Potential Treatment Install Edgeline Rumble Strips
Figure 10. MUTCD Excerpt on Chevron Sign Spacing
Figure 11. Curve Radius Calculation
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