USA Banner
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock ( LockA 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 TransportationU.S. Department of Transportation IconUnited States Department of TransportationUnited States Department of Transportation
FHWA Highway Safety Programs
Road Diet Informational Guide
rdig.pdf (1.89 MB)
November 2014
Contact: Rebecca Crowe at rebecca.crowe@dot.gov(link sends email), 202-507-3699
Technical Report Documentation Page
| 1. Report No. FHWA-SA-14-028 |
2. Government Accession No. | 3. Recipient’s Catalog No. | |
| 4. Title and Subtitle Road Diet Informational Guide |
5. Report Date November 2014 |
||
| 6. Performing Organization Code | |||
| 7. Author(s) Keith Knapp, Brian Chandler, Jennifer Atkinson, Thomas Welch, Heather Rigdon, Richard Retting, Stacey Meekins, Eric Widstrand, and R.J. Porter |
8. Performing Organization Report No. | ||
| 9. Performing Organization Name and Address Leidos 11251 Roger Bacon Drive Reston, VA 20190 Subconsultants: Iowa State University, Sam Schwartz Engineering, University of Utah |
10. Work Unit No. (TRAIS) | ||
| 11. Contract or Grant No. Contract No. DTFH61-10-D-00024, Task Order No. T-12-004 |
|||
| 12. Sponsoring Agency Name and Address Federal Highway Administration Office of Safety 1200 New Jersey Avenue SE Washington, DC 20590 |
13. Type of Report and Period Covered Informational Guide Book August 2011 to July 2014 |
||
| 14. Sponsoring Agency Code HSA |
|||
| 15. Supplementary Notes Rebecca Crowe ( rebecca.crowe@dot.gov(link sends email)), Office of Safety Technologies ( http://safety.fhwa.dot.gov/), served as the Technical Manager for the Federal Highway Administration (FHWA). The following FHWA staff members contributed as technical working group members, reviewers and/or provided input or feedback to the project at various stages: Peter Eun, David Morena, Tamara Redmond, and Jeff Shaw. |
|||
| 16. Abstract A classic Road Diet converts an existing four-lane undivided roadway segment to a three-lane segment consisting of two through lanes and a center two-way left turn lane (TWLTL). A Road Diet improves safety by including a protected left-turn lane for mid-block left-turning motorists, reducing crossing distance for pedestrians, and reducing travel speeds that decrease crash severity. Additionally, the Road Diet provides an opportunity to allocate excess roadway width to other purposes, including bicycle lanes, on-street parking, or transit stops. This Informational Guide includes safety, operational, and quality of life considerations from research and practice, and guides readers through the decision-making process to determine if Road Diets are a good fit for a certain corridor. It also provides design guidance and encourages post-implementation evaluation. |
|||
| 17. Key Words Road Diet, four-lane, undivided, three-lane, two-way-leftturn- lane, cross section, safety, operations, reconfiguration, queuing. |
18. Distribution Statement No restrictions. |
||
| 19. Security Classification (of this report) Unclassified |
20. Security Classification (of this page) Unclassified |
21. No of Pages 72 |
22. Price N/A |
Form DOT F 1700.7 (8-72)
Reproduction of completed page authorized.
Menu Main navigation (Desktop)