U.S. Department of Transportation
Federal Highway Administration
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Washington, DC 20590
202-366-4000
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-21-013 Date: July 2021 |
Publication Number: FHWA-HRT-21-013 Date: July 2021 |
PDF Version (1.18 MB)
Technical Report Documentation Page
1. Report No.
FHWA-HRT-21-013 |
2. Government Accession No. | 3 Recipient's Catalog No. | ||
4. Title and Subtitle
Developing Crash Modification Factors for Bicycle-Lane Additions While Reducing Lane and Shoulder Widths |
5. Report Date
July 2021 |
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6. Performing Organization Code | ||||
7. Author(s)
Raul Avelar (ORCID: 0000-0002-3962-1758), Karen Dixon (ORCID: 0000-0002-8431-9304), Sruthi Ashraf (ORCID: 0000-0002-3304-9682), Ankit Jhamb (ORCID: 0000-0002-6123-9352), and Bahar Dadashova (ORCID: 0000-0002-4592-9118) |
8. Performing Organization Report No. | |||
9. Performing Organization Name and Address
Texas A&M Transportation Institute |
10. Work Unit No. (TRAIS) | |||
11. Contract or Grant No.
DTFH6116D00039 |
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12. Sponsoring Agency Name and Address
Office of Safety Research and Development |
13. Type of Report and Period Covered
Final Report; May 2017–April 2021 |
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14. Sponsoring Agency Code
HRDS-20 |
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15. Supplementary Notes
The Federal Highway Administration Development of Crash Modification Factors Program and Task Manager for this project was Roya Amjadi (HRDS-20; ORCID: 0000-0002-8426-0867). |
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16. Abstract
This project evaluated bicycle-lane additions when reducing lane and shoulder width as a safety-improvement strategy (also known as a safety intervention). Crash modification factors (CMFs) and benefit–cost (B/C) ratios were estimated for total, fatal and injury, and property-damage-only (PDO) crashes. Researchers studied facilities that included urban two- and four-lane arterials, collectors, and local roads in Washington and Texas. The study design was cross sectional and included sites without bicycle lanes but with similar characteristics to sites with bicycle lanes. The research team applied propensity score methods on data collection and in statistical analyses to improve the balance between treated and comparison sites. Results for Washington suggested reductions for fatal and injury (0.772 CMF, statistically insignificant) and PDO (0.885 CMF, statistically insignificant) crashes, but the small sample size resulted in large uncertainties for these estimates.
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17. Key Words
Safety, crash modification factors, CMFs, bicycle lanes |
18. Distribution Statement
No restrictions. This document is available to the public through the National Technical 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
61 |
22. Price
N/A |
Form DOT F 1700.7 (8-72) | Reproduction of completed page authorized |