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
Median Intersection Design Jan-95 Douglas W. Harwood NCHRP-375
Accident Relationships of Roadway Widths on Low-Volume Roads Jan-94 Charles V. Zegeer NCHRP-362
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
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
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

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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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