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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
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
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
Cost Effective Safety Improvements for Two-Lane Rural Roads Mar-08 Wang, Y., N.H. Nguyen, A.B.E. Levy, and Y. Wu TNW2008-04
NCHRP Project 17-29, "Methodology to Predict the Safety Performance of Rural Multilane Highways" Feb-08 Lord, D. (Principal Investigator, Texas A&M Reserach Foundation)
NCHRP Project 17-29, "Methodology to Predict the Safety Performance of Rural Multilane Highways" Feb-08 Lord, D. (Principal Investigator, Texas A&M Research Institute)
NCHRP Report 615: Evaluation of the Use and Effectiveness of Wildlife Crossings Jan-08 Bissonette, J.A. and P.C. Cramer
NCHRP Report 617: Accident Modification Factors for Traffic Engineering and ITS Improvements Jan-08 Harkey, D.L., R. Srinivasan, J. Baek, F.M. Council, K. Eccles, N. Lefler, F. Gross, B. Persaud, C. Lyon, E. Hauer, and J.A. Bonneson
NCHRP Report 627: Traffic Safety Evaluation of Nighttime and Daytime Work Zones Jan-08 Ullman, G.L., M.D. Finley, J.E. Bryden, R. Srinivasan, and F.M. Council
Framework for Selection and Evaluation of Bicycle and Pedestrian Safety Projects in Virginia Jan-08 Natarajan, S., M.J. Demetsky, and K.E. Lantz Jr. VTRC 08-R8
Economic Impact of Traffic Incidents on North Carolina's Interstate Facilities Jan-08 Khattak, A.J., C. Teague, X. Pan, Y. Fan, and D.A. Rodriguez FHWA/NC/2006-53
NCHRP Project 17-26, "Methodology to Predict the Safety Performance of Urban and Suburban Arterials: Jan-08 Harwood, D. (Principal Investigator, Midwest Research Institute)
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
NCHRP Project 25-27, "Evaluation of the Use and Effectiveness of Wildlife Crossings" Sep-07 Bissonette, J.A. (Principal Investigator, Utah State University)
Interchange Safety Analysis Tool (ISAT): User Manual Jun-07 Torbic, D.J., D.W. Harwood, D.K. Gilmore, and K.R. Richard FHWA-HRT-07-045
FHWA Technical Report - Safety Analysis of Interchanges Jun-07 Torbic, D.J., D.W. Harwood, D.K. Gilmore, and K.R. Richard
Safety Effects of Left-Turn Phasing Schemes at High-Speed Intersections Jan-07 Davis, G.A. and N. Aul
Wildlife-Vehicle Collision Reduction Study: Report to Congress Jan-07 Huijser, M.P., P.T. McGowen, J. Fuller, A. Hardy, and A. Kociolek
NCHRP Project 3-67, "Expert System for Recommending Speed Limits in Speed Zones" Nov-06 Srinivasan, R., M. Parker, D. Harkey, D. Tharpe, and R. Sumner
Safety Impacts of Pavement Edge Drop-offs Sep-06 Hallmark, S.L., D. Veneziano, T. McDonald, J. Graham, R. Patel, and F.M. Council
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

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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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