Safety Impacts of "Road Diets" in Iowa

Institute of Transportation Engineers. ITE Journal, Dec 2006 by Stout, Thomas B, Pawlovich, Michael D, Souleyrette, Reginald R, Carriquiry, Alicia

2. Highway Safety Information Systems (HSIS) Summary. "Evaluation of Lane Reduction 'Road Diet' Measures and Their Effects on Crashes and Injuries." Publication HSIS FHWA-HRT-04-082 (2004). Accessible via www.hsisinfo.org/pdf/04-082.htm.

3. HSIS Summary. "Evaluation of Lane Reduction 'Road Diet' Measures and Their Effects on Crashes and Injuries." ITE Journal, Vol. 75, No. 5 (May 2005): 37-42.

4. Huang, Stewart, Zegeer, note 1 above; HSIS, note 2 above; and HSIS, note 3 above.

5. Knapp, K. and K. Giese. Guidelines for the Conversion of Urban Four-Lane Undivided Roadways to Three-Lane Two-way Left-Turn Facilities. Iowa State University/Center for Transportation Research and Education for the Iowa Department of Transportation (April 2001). Accessible via www.ctre.iastate.edu/reports/4to3lane.pdf.

6. Gelman, A. et al. Bayesian Data Analysis, 2nd Edition. Chapman & Hill: London, England, 2004.

7. Pawlovich, M.D. Evaluating Traffic Safety Network Screening: An Initial Framework Utilizing the Hierarchical Bayesian Philosophy. Unpublished doctoral dissertation, Department of Civil and Construction Engineering, Iowa State University, Ames, IA, USA, 2003.

8. Hauer, E. Observational Before-After Studies in Road Safety. Pergamon: Oxford, UK, 1997.

9. For a more complete explanation, see www.dot.state.ia.us/crashanalysis/pdfs/iowa4to3 laneconversion_fullbayes_june2005.pdf.

10. Note 4 above.

11. For a more complete discussion, see www. dot.state.ia.us/crashanalysis/pdfs/trb_roaddiet_ papersubmission_08012005.pdf.

BY THOMAS B. STOUT, PH.D., P.E., MICHAEL D. PAWLOVICH, PH.D., P.E., REGINALD R. SOULEYRETTE, PH.D., P.E. AND ALICIA CARRIQUIRY, PH.D.

THOMAS B. STOUT, Ph.D., P.E., is a post-doctoral research associate with the Center for Transportation Research and Education (CTRE) at Iowa State University. He holds a B.S.E. in civil engineering from Sacramento State College, an M.S. in civil engineering from the University of Nebraska and a Ph.D. in civil engineering from Iowa State University. He has more than 30 years of professional experience in civil and transportation engineering and is a member of ITE.

MICHAEL D. PAWLOVICH, Ph.D., P.E., is a traffic safety engineer with the Iowa Department of Transportation Office of Traffic and Safety. Prior to that, he worked as a graduate student at Iowa State University with CTRE, where he earned his Ph.D. in civil engineering.

REGINALD R. SOULEYRETTE, Ph.D., P.E., is Gerald and Audrey Professor of civil engineering at Iowa State University, where he is director of Graduate Education and associate director for Transportation Planning and Information Systems at CTRE. He holds a B.S.C.E. and M.S.C.E. from the University of Texas at Austin and a Ph.D. from the University of California, Berkeley. He is co-chair of the Transportation Research Board committee on Spatial Data and Information Sciences and chair of the American Society of Civil Engineers Committee on Transportation Planning and Economics.

ALICIA CARRIQUIRY, Ph.D., is professor of statistics at Iowa State University, where she has also served as associate provost. Her research interests are in Bayesian statistics and general methods. She received a master's in animal science from the University of Illinois, a master's in statistics and a Ph.D. in statistics and animal genetics from Iowa State University.