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
Stopping Sight Distance - II Kay Fitzpatick
An Attempt to Define the Relationship Between Forces to Crash-Test Vehicles and Occupant Injury in S Forrest Council et al. FHWA-RD-95-165
Zero Tolerance: Four States Experience John Lacey and Ralph Jones DOT-HS-809-053
Study of Accidents at Signalized Intersections Phase I Final Report ereen J. Wolverton and John J. Monce
Impacts of access management techniques Jerome Gluck, Herbert S.Levinson, and Vergil Stover NCHRP-420
Safety Effectiveness of Intersection Left-and Right-Turn Lanes Douglas W. Harwood, Karin M. Bauer, Ingrid B. Potts, Darren J. Torbic, Karen R. Richard, Emilia R. Kohlman Rabbani, Ezra Hauer, Lily Elefteriadou, and Michael S. Griffith FHWA-RD-02-089
Study Designs for Passing Sight Distance Requirements: Final Report Apr-92 Warren Hughes, Sarath Joshua, and Hugh McGee FHWA-RD-91-078
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
Accident Relationships of Roadway Widths on Low-Volume Roads Jan-94 Charles V. Zegeer NCHRP-362
Median Intersection Design Jan-95 Douglas W. Harwood NCHRP-375
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
Development of Severity Indices for Roadside Objects: Resource Materials Sep-95 Forrest M. Council and J. Richard Stewart FHWA-RD-95-165
Capacity and Operational Effects of Mid-Block left Turn Lanes Jan-97 James A. Bonneson and Patrick T. McCoy NCHRP-295
Small Target Visibility Jan-97 Doug Mace
An Investigation of Older Driver Freeway Needs and Capabilities May-97 R. Knoblauch, M. Nitzburg, and R. Seifert FHWA-RD-95-194
Safety Effects of Cross-section Design on Rural Multi-lane Highway May-98 Jun Wang, Warren E. Hughes, Richard Stewart FHWA-RD-98-071
Accident Models for Two-Lane Rural Segments and Intersections Oct-98 Andrew Vogt and Joe Bared FHWA-RD-98-133
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
Implementation of GIS-Based Highway Safety Analyses Jan-01 Richard C. Smith, David L. Harkey, and Bobby Harris FHWA-RD-01-039
Overview of Current Intersection Safety Conditions: Phase I Result Nov-01 D.W. Harwood, D.J. Torbic, K.R. Richard, and Y.R. Mohamedshah

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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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