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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
| REPORT |
| This report is an archived publication and may contain dated technical, contact, and link information |
 |
| Publication Number: FHWA-HRT-17-064 Date: March 2018 |
Publication Number: FHWA-HRT-17-064 Date: March 2018 |
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The research documented in this report was conducted as part of the Federal Highway Administration’s (FHWA) Evaluation of Low-Cost Safety Improvements Pooled Fund Study (ELCSI-PFS). FHWA established this PFS in 2005 to conduct research on the effectiveness of the safety improvements identified by the National Cooperative Highway Research Program Report 500 Guides as part of the implementation of the American Association of State Highway and Transportation Officials (AASHTO) Strategic Highway Safety Plan.(1) The ELCSI-PFS studies provide a crash modification factor and benefit–cost economic analysis for each of the targeted safety strategies identified as priorities by the pooled fund member States.
This study evaluated the safety effects of converting full movement, stop-controlled intersections to right-in-right-out (RIRO) operation with physical barriers. The results indicated reductions for all crash types (i.e., total, all intersection-related and fatal and injury intersection-related) for stop-controlled intersections with RIRO compared to full movement intersections. While the economic analysis suggests the strategy can be cost-effective in reducing crashes at stop-controlled intersections, potential costs and benefits need to be analyzed on a case-by-case basis. This document is intended for safety engineers, highway designers, planners, and practitioners at State and local agencies involved with AASHTO Strategic Highway Safety Plan implementation.
Monique R. Evans, P.E., CPM
Director, Office of Safety
Research and Development
Notice
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.
The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers' names appear in this report only because they are considered essential to the objective of the document.
Quality Assurance Statement
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Technical Report Documentation Page
| 1. Report No.
FHWA-HRT 17-064 |
2. Government Accession No.
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3 Recipient's Catalog No.
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| 4. Title and Subtitle
Safety Evaluation of Turning Movement Restrictions at Stop-Controlled Intersections |
5. Report Date
March 2018 |
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| 6. Performing Organization Code
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| 7. Author(s)
Thanh Le, Frank Gross, Tim Harmon, and Kimberly Eccles |
8. Performing Organization Report No.
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| 9. Performing Organization Name and Address
VHB |
10. Work Unit No. (TRAIS)
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| 11. Contract or Grant No.
DTFH61-13-D-00001 |
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| 12. Sponsoring Agency Name and Address
U.S. Department of Transportation |
13. Type of Report and Period Covered
Final Report; June 2015–September 2017 |
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| 14. Sponsoring Agency Code
HRDS-20 |
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| 15. Supplementary Notes
The Federal Highway Administration (FHWA) Office of Safety Research and Development managed this study under the Development of Crash Modification Factors program. The FHWA Office of Safety Research and Development program and Task Manager was Roya Amjadi (HRDS-20). |
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| 16. Abstract
The Development of Crash Modification Factors program conducted a safety evaluation of turning movement restrictions at stop-controlled intersections for the Evaluation of Low Cost Safety Improvements Pooled Fund Study. This study evaluated the safety effects of converting full movement, stop-controlled intersections to right-in-right-out (RIRO) operation using physical barriers, as measured by the change in crash frequency. The project team obtained geometric, traffic, and crash data for urban, three-legged, full movement and RIRO stop-controlled intersections, as well as the downstream four-legged, stop-controlled or signalized intersection with full movement in California. The team used a cross-sectional analysis to estimate the effects of turning movement restrictions while controlling for other differences between sites with RIRO and full movement. Aggregate results indicated reductions for all crash types analyzed (i.e., total, all intersection-related, and fatal and injury intersection-related) for stop-controlled intersections with RIRO compared to full movement. Reductions were statistically significant at the 95-percent confidence level for all crash types. Crash modification factors for total, all intersection-related, and fatal and injury intersection-related crashes were 0.55, 0.32, and 0.20, respectively. Based on the disaggregate results, RIRO intersections do not appear to have differing effects for different levels of traffic, design speed, or number of lanes. Potential for crash migration in determining net benefits needs to be considered. Results indicated potential increases at downstream intersections, but many increases are not statistically significant even at the 90-percent confidence level. While the economic analysis suggests the strategy can be cost-effective in reducing crashes at a hypothetical stop-controlled intersection, potential costs and benefits with site-specific values need to be analyzed on a case-by-case basis. |
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| 17. Key Words
Turning movement restrictions, low-cost, safety improvements, safety evaluations |
18. Distribution Statement
No restrictions. This document is available to the public through the National Techincal Information Service, Springfield, VA 22161. |
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| 19. Security Classification (of this report) Unclassified |
20. Security Classification (of this page) Unclassified |
21. No. of Pages
56 |
22. Price
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| Form DOT F 1700.7 (8-72) | Reproduction of completed page authorized |
