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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
Accident Models for Two-Lane Rural Segments and Intersections Oct-98 Andrew Vogt and Joe Bared FHWA-RD-98-133
NCHRP Report 518: Safety Evaluation of Permanent Raised Pavement Markers Jan-04 Bahar, G., C. Mollett, B. Persaud, C. Lyon, A. Smiley, T. Smahel, and H. McGee
Pavement Marking Materials and Markers: Real-World Relationship Between Retroreflectivity and Safe Apr-06 Bahar, G., M. Masliah, T. Erwin, E. Tan, and E. Hauer NCHRP Project 17-28
NCHRP Project 25-27, "Evaluation of the Use and Effectiveness of Wildlife Crossings" Sep-07 Bissonette, J.A. (Principal Investigator, Utah State University)
NCHRP Report 615: Evaluation of the Use and Effectiveness of Wildlife Crossings Jan-08 Bissonette, J.A. and P.C. Cramer
NCHRP Report 5-19, "Analysis of Visual Performance Benefits from Roadway Lighting" Jun-09 Bullough, J.D., M.S. Rea, and Y. Zhou
Accident Relationships of Roadway Widths on Low-Volume Roads Jan-94 Charles V. Zegeer NCHRP-362
NCHRP Research Report 841: Development of Crash Modification Factors for Uncontrolled Pedestrian Crossing Treatments Jan-17 Charles Zegeer, Raghavan Srinivasan, Bo Lan, Daniel Carter, Sarah Smith, Carl Sundstrom, Nathan J. Thirsk, Craig Lyon, Bhagwant Persaud, John Zegeer, Erin Ferguson, and Ron Van Houten
Guidance for Future Design of Freeways with High-Occupancy Vehicle (HOV) Lanes Based on an Analysis May-04 Cothron, A.S., S.E. Ranft, C.H. Walters, D.W. Fenno, and D. Lord FHWA/TX-05/0-4434-P1
Crash Analysis of Selected High-Occupancy Vehicle Fatalities in Texas: Methodology, Findings, and Re May-04 Cothron, A.S., S.E. Ranft, C.H. Walters, D.W. Fenno, and D. Lord FHWA/TX-040-4434-1
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
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 Wet-Reflective Pavement Markings Oct-15 Craig Lyon, Bhagwant Persaud, and Kimberly Eccles FHWA-HRT-15-065
Prediction of the Expected Safety Performance of Rural Two-Lane Highways Dec-00 D. W. Harwood, F. M. Council, E. Hauer, W. E. Hughes, and A. Vogt FHWA-RD-99-207
Overview of Current Intersection Safety Conditions: Phase I Result Nov-01 D.W. Harwood, D.J. Torbic, K.R. Richard, and Y.R. Mohamedshah
NCHRP Web-Only Document 297: Intersection Crash Prediction Methods for the Highway Safety Manual Jan-21 Darren J. Torbic, Daniel J. Cook, Karin M. Bauer, Joseph R. Grotheer, Douglas W. Harwood, Ingrid B. Potts, Richard J. Porter, Jeffrey P. Gooch, Kristin Kersavage, Juan Medina, and Jeffrey Taylor
NCHRP Web-Only Document 227: Design of Interchange Loop Ramps and Pavement/Shoulder Cross-Slope Breaks Jan-17 Darren J. Torbic, Lindsay M. Lucas, Douglas W. Harwood, Marcus A. Brewer, Eun Sug Park, Raul Avelar, Michael P. Pratt, Akram Abu-Odeh, Elizabeth Depwe, and Kimberly Rau
Safety Effects of Left-Turn Phasing Schemes at High-Speed Intersections Jan-07 Davis, G.A. and N. Aul
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
Small Target Visibility Jan-97 Doug Mace

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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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