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
Zero Tolerance: Four States Experience John Lacey and Ralph Jones DOT-HS-809-053
Wildlife-Vehicle Collision Reduction Study: Report to Congress Jan-07 Huijser, M.P., P.T. McGowen, J. Fuller, A. Hardy, and A. Kociolek
Wildlife-Vehicle Collision Reduction Study: Best Practices Manual Oct-08 Huijser, M.P., P. McGowen, A.P. Clevenger, and R. Ament
Traffic Operations Control for Older Drivers. Final Report Mar-95 R. Knoblauch, M. Nitzburg, D. Reinfurt, F. Council, C. Zegeer, and C. Popkin FHWA-RD-94-119
Study of Accidents at Signalized Intersections Phase I Final Report ereen J. Wolverton and John J. Monce
Study Designs for Passing Sight Distance Requirements: Final Report Apr-92 Warren Hughes, Sarath Joshua, and Hugh McGee FHWA-RD-91-078
Stopping Sight Distance - II Kay Fitzpatick
Speed and Safety in North Carolina Aug-13 Libby Thomas, Raghavan Sirnivasan, Bo Lan, Wiliam Hunter, Carol Martell, and Eric Rodgman
Spatially Disaggregate Panel Models of Crash and Injury Counts: The Effect of Speed Limits and Desig Jan-03 Kweon, Y.J. and K.M. Kockelman
Small Target Visibility Jan-97 Doug Mace
Safety Impacts of Pavement Edge Drop-offs Sep-06 Hallmark, S.L., D. Veneziano, T. McDonald, J. Graham, R. Patel, and F.M. Council
Safety Evaluation of Wet-Reflective Pavement Markings Oct-15 Craig Lyon, Bhagwant Persaud, and Kimberly Eccles FHWA-HRT-15-065
Safety Evaluation of Turning Movement Restrictions at Stop-Controlled Intersections Mar-18 Thanh Le, Frank Gross, Tim Harmon, and Kimberly Eccles FHWA-HRT-17-064
Safety Evaluation of STOP AHEAD Pavement Markings Mar-08 Gross, F.B., R. Jagannathan, B.N. Persaud, C. Lyon, K. Eccles, N. Lefler, and R. Amjadi FHWA-HRT-08-043
Safety Evaluation of Red-Light Cameras Apr-05 Council, F.M., B.N. Persaud, K.A. Eccles, C. Lyon, and M.S. Griffith FHWA-HRT-05-048
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
Safety Evaluation of Installing Center Two-Way Left-Turn Lanes on Two-Lane Roads Dec-07 Persaud, B., C. Lyon, K.A. Eccles, N.X. Lefler, D.L. Carter, and R. Amjadi FHWA-HRT-08-042
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 Horizontal Curve Realignment on Rural, Two-Lane Road Apr-18 Raghavan Srinivasan, Daniel Carter, Craig Lyon, and Matthew Albee FHWA-HRT-17-066
Safety Evaluation of Flashing Beacons at STOP-Controlled Intersections Mar-08 Srinivasan, R., D.L. Carter, K.A. Eccles, B. Persaud, N.X. Lefler, C. Lyon, and R. Amjadi FHWA-HRT-08-044

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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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