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Turner-Fairbank Highway Research Center


Research Reports

A variety of research studies have been performed using data from HSIS. Many of the final reports prepared are now available electronically. A complete list of available publications is provided below.

Title Pub Date Author Report Number
NCHRP Project 03-106: Traffic Control Device Guidelines for Curves Apr-15 Paul J. Carlson, Bradford K. Brimley, Gene Hawkins, Scott Himes, Hugh McGee, and Frank Gross
Safety Effects of Horizontal Curve and Grade Combinations on Rural Two-Lane Highways Jan-14 Karin M. Bauer, Douglas W. Harwood FHWA-HRT-13-077
NCHRP Research Report 780: Design Guidance for Intersection Auxiliary Lanes Jan-14 Kay Fitzpatrick, Marcus A. Brewer, Paul Dorothy, and Eun Sug Park
NCHRP Research Report 783: Evaluation of the 13 Controlling Criteria for Geometric Design Jan-14 Douglas W. Harwood, Jessica M. Hutton, Chris Fees, Karin M. Bauer, Alan Glen, and Heidi Ouren
NCHRP Research Report 790: Factors Contributing to Median Encroachments and Cross-Median Crashes Jan-14 Douglas W. Harwood, David K. Gilmore, Jerry L. Graham, and Mitchell K. O’Laughlin, Alison M. Smiley, and Thomas P. Smahel
Speed and Safety in North Carolina Aug-13 Libby Thomas, Raghavan Sirnivasan, Bo Lan, Wiliam Hunter, Carol Martell, and Eric Rodgman
NCHRP Research Report 705: Evaluation of Safety Strategies at Signalized Intersections Jan-11 Raghavan Srinivasan, Jongdae Baek, Sarah Smith, Carl Sundstrom, Daniel Carter, Craig Lyon, Bhagwant Persaud, Frank Gross, Kim Eccles, Ajmal Hamidi, and Nancy Lefler
Development of a Speeding-Related Crash Typology Apr-10 Council, F.M., M. Reurings, R. Srinivasan, S. Masten, and D. Carter FHWA-HRT-10-024
Safety Evaluation of Improved Curve Delineation Sep-09 Raghavan Srinivasan, Jongdae Baek, Daniel Carter, Bhagwant Persaud, Craig Lyon, Kimberly Eccles, Frank Gross, and Nancy Lefler FHWA-HRT-09-045
Safety Evaluation of Lane and Shoulder Width Combinations on Rural, Two-Lane, Undivided Roads Jun-09 Gross, F., P.P. Jovanis, K.A. Eccles, and K. Chen FHWA-HRT-09-031
NCHRP Project 5-19, "Analysis of Safety Effects for the Presence of Roadway Lighting" Jun-09 Donnell, E.T., V. Shankar, and R.J. Porter
NCHRP Report 5-19, "Analysis of Visual Performance Benefits from Roadway Lighting" Jun-09 Bullough, J.D., M.S. Rea, and Y. Zhou
NCHRP 5-19, "Review of the Safety Benefits and Other Effects of Roadway Lighting" Jun-09 Rae, M.S., J.D. Bullough, C.R. Fay, J.A. Brons, J.V. Derlofske, and E.T. Donnell
Low-Cost Safety Enhancements for Stop-Controlled and Signalized Intersections May-09 FHWA FHWA-SA-09-020
NCHRP Report 633: Impact of Shoulder Width and Median Width on Safety Jan-09 Stamatiadis, N., J. Pigman, J. Sacksteder, W. Ruff, and D. Lord
NCHRP Report 641: Guidance for the Design and Application of Shoulder and Centerline Rumble Strips Jan-09 Trobic, D.J., J.M. Hutton, C.D. Bokenkroger, K.M. Bauer, D.W. Harwood, D.K. Gilmore, J.M. Dunn, J.J. Ronchetto, E.T. Donnell, H.J. Sommer III, P. Garvey, B. Persaud, and C. Lyon
NCHRP Report 633: Impact of Shoulder Width and Median Width on Safety. Jan-09 Stamatiadis, N., J. Pigman, J. Sacksteder, W. Ruff, and D. Lord
NCHRP Project 15-27, "Safety Impacts of Design Element Trade-Offs" Jan-09 Stamatiadis, N.
Long Term Pavement Performance Computed Parameter: Frost Penetration Nov-08 Selezneva, O.I., Y.J. Jiang, G. Larson, and T. Puzin FHWA-HRT-08-057
Wildlife-Vehicle Collision Reduction Study: Best Practices Manual Oct-08 Huijser, M.P., P. McGowen, A.P. Clevenger, and R. Ament

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Safety Effects of Horizontal Curve and Grade Combinations on Rural Two-Lane Highways

The safety effects of horizontal curves and grades on rural two-lane highways have been quantified in the American Association of State Highway and Transportation Officials (AASHTO) Highway Safety Manual (HSM), but it was not previously known whether and how the safety performance of horizontal curves and grades interact. Furthermore, there are no established safety effects for crest and sag vertical curves, and it is unknown whether and how the safety performance of crest or sag vertical curves is affected by the presence of horizontal curves.

The objective of this study was to quantify the combined safety effects of horizontal curves and grade combinations and express the results as crash modification factors (CMFs) that can be considered for use in the AASHTO HSM.

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Safety Evaluation of Converting Traffic Signals from Incandescent to Light-Emitting Diodes

Across the Nation, many agencies have been replacing conventional incandescent light bulbs in traffic signals with light-emitting diodes (LED). LEDs are primarily installed to reduce energy consumption and decrease maintenance. In addition, LEDs are expected to last much longer compared with incandescent bulbs and tend to age gradually. However, a recent study revealed several potential problems with LEDs, including their inability to melt snow and issues related to visual discomfort caused by glare at night.

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Safety Evaluation Of Discontinuing Late-Night Flash Operations at Signalized Intersections

During late-night flash (LNF) mode (from late night to early morning hours), traffic signals flash yellow for one road (typically, the major road), requiring caution but no stopping, and flash red for the other road (typically, the minor road), requiring drivers to stop and then proceed through the intersection after yielding to the traffic on the major road. The intent of LNF is to reduce energy consumption and delay during periods of low traffic demand. However, in recent years, many agencies have begun replacing LNF with normal phasing operation because of safety concerns.

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