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
Study Designs for Passing Sight Distance Requirements: Final Report Apr-92 Warren Hughes, Sarath Joshua, and Hugh McGee FHWA-RD-91-078
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 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
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
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
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 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.
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 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
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
Development of Relationship Between Truck Accidents and Geometric Design: Phase 1. Final Report Aug-93 S.-P. Miaou, P.S. Hu, T. Wright, S.C. Davis, and A.K. Rathi
Implementation of GIS-Based Highway Safety Analyses Jan-01 Richard C. Smith, David L. Harkey, and Bobby Harris FHWA-RD-01-039
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
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
An Investigation of Older Driver Freeway Needs and Capabilities May-97 R. Knoblauch, M. Nitzburg, and R. Seifert FHWA-RD-95-194
NCHRP Report 524: Safety of U-Turns at Unsignalized Median Openings Jan-04 Potts, I.B., D.W. Harwood, D.J. Torbic, K.R. Richard, J.S. Gluck, H.S. Levinson, P.M. Garvey, and R.S. Ghebrial
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 8-36, Task 26, "Surface Transportation Safety and Investment" Jul-02 Neuman, T. (CH2M HILL)

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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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