U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
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 |
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| Publication Number: FHWA-HRT-21-024 Date: August 2021 |
Publication Number: FHWA-HRT-21-024 Date: August 2021 |
PDF Version (2.53 MB)
Technical Report Documentation Page
| 1. Report No.
FHWA-HRT-21-024 |
2. Government Accession No. | 3 Recipient's Catalog No. | ||
| 4. Title and Subtitle
FHWA Research and Technology Evaluation: Innovative Intersection Design |
5. Report Date
August 2021 |
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| 6. Performing Organization Code OST-R V-321 |
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| 7. Author(s)
Jonathan Badgley (ORCID: 0000-0002-0096-119X), Joshua Fowler (ORCID: 0000-0001-8956-0896), Kendall Mahavier (ORCID: 0000-0003-4427-5092), and Sean Peirce (ORCID: 0000-0001-7296-8799) |
8. Performing Organization Report No. DOT-VNTSC-FHWA-19-22 |
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| 9. Performing Organization Name and Address
Volpe National Transportation Systems Center |
10. Work Unit No. | |||
| 11. Contract or Grant No.
HW9AA300 |
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| 12. Sponsoring Agency Name and Address
Office of Corporate Research, Technology, and Innovation Management |
13. Type of Report and Period Covered
Final Report; 2000–2019 |
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| 14. Sponsoring Agency Code
HRTM-10 |
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| 15. Supplementary Notes
John Moulden (HRTM-10) is the Research and Technology Program Manager and the Contracting Officer's Representative. |
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| 16. Abstract
This report assesses the effects of the Federal Highway Administration's (FHWA's) investment in the Innovative Intersection Design research program and related activities on the availability and quality of such research; awareness and adoption of innovative intersection designs in the United States; and impact of deployed innovative intersection designs on road-user safety, traffic mobility, and construction costs of the U.S. transportation system. The particular intersection and interchange designs researched by FHWA and included in this evaluation are diverging diamond interchanges, restricted-crossing U-turns, displaced left turns, median U-turns, and mini-roundabouts. Although it is difficult measure the effects of specific FHWA activities, the evaluation found strong evidence of FHWA's influence on the acceptance, consideration, and adoption of innovative intersection designs. The findings suggest awareness, adoption, and deployment are higher than they would have been without FHWA research and activities. FHWA laid the foundation for national adoption and deployment of innovative intersection designs by providing empirical evidence of the potential improvements to safety, mobility, and construction costs; increasing stakeholders' awareness of and confidence in them; and contributing to the development of design standards. FHWA's impact is conservatively estimated to have provided road-user safety, traffic mobility, and construction-cost benefits totaling more than $200 million (undiscounted) over the last decade. |
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| 17. Key Words
Intersection, interchange, mini-roundabouts,restricted-crossing U-turns, median U-turns,diverging diamond interchange, displaced leftturns |
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
98 |
22. Price
N/A |
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| Form DOT F 1700.7 (8-72) | Reproduction of completed page authorized |
