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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
Accident Relationships of Roadway Widths on Low-Volume Roads Jan-94 Charles V. Zegeer NCHRP-362
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
An Investigation of Older Driver Freeway Needs and Capabilities May-97 R. Knoblauch, M. Nitzburg, and R. Seifert FHWA-RD-95-194
Capacity and Operational Effects of Mid-Block left Turn Lanes Jan-97 James A. Bonneson and Patrick T. McCoy NCHRP-295
Comparative Evaluation of Automated Wind Warning Systems - Showcase Evaluation #15 Feb-06 Kumar, M. and C. Strong
Contributing Factors for Focus Crash and Facility Types Nov-20 Taha Saleem, Richard Porter, Raghavan Srinivasan, Daniel Carter, Scott Himes, and Thanh Le FHWA-HRT-20-052
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
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
Crash Prediction Method for Freeway Facilities with High Occupancy Vehicle (HOV) and High Occupancy Toll (HOT) Lanes Jul-15 Sivaramakrishnan Srinivasan, Philip Haas, Priyanka Alluri, Albert Gan, and James Bonneson
Developing Vehicle Occupancy Factors and Percent of Non-Single Occupancy Vehicle Travel Apr-19 Robert Krile, Andrew Landgraf, and Elizabeth Slone FHWA-PL-18-020
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
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
Development of Severity Indices for Roadside Objects: Resource Materials Sep-95 Forrest M. Council and J. Richard Stewart FHWA-RD-95-165
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
FHWA Technical Report - Safety Analysis of Interchanges Jun-07 Torbic, D.J., D.W. Harwood, D.K. Gilmore, and K.R. Richard
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
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
Impact Induced Fires & Fuel Leakage: Statistical Analysis of FARS and State Date Files (1978-2001) Oct-03 Friedman, K., T. Kenney, and E. Holloway
Impacts of access management techniques Jerome Gluck, Herbert S.Levinson, and Vergil Stover NCHRP-420

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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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