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
Roadside Grading Guidance - Phase I Dec-21 Kevin Schrum, Francisco D.B. Albuquerque, Dean Sicking, Ronald K Faller, and John. D Reid.
NCHRP Web-Only Document 295: Improved Prediction Models for Crash Types and Crash Severities Jan-21 John N. Ivan, Sha Al Mamun, Nalini Ravishanker, Bhagwant Persaud, Craig Lyon, Raghavan Srinivasan, Bo Lan, Sarah Smith, Taha Saleem, Mohamed Abdel-Aty, Jaeyoung Lee, Ahmed Farid, and Jung-Han Wang
NCHRP Web-Only Document 297: Intersection Crash Prediction Methods for the Highway Safety Manual Jan-21 Darren J. Torbic, Daniel J. Cook, Karin M. Bauer, Joseph R. Grotheer, Douglas W. Harwood, Ingrid B. Potts, Richard J. Porter, Jeffrey P. Gooch, Kristin Kersavage, Juan Medina, and Jeffrey Taylor
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
Rural Speed Safety Project for USDOT Safety Data Initiative May-20 Subasish Das, Srinivas Geedipally, Raul Avelar, Lingtao Wu, Kay Fitzpatrick, MohamadrezaBanihashemi, and Dominique Lord
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
Safety Evaluation of Horizontal Curve Realignment on Rural, Two-Lane Road Apr-18 Raghavan Srinivasan, Daniel Carter, Craig Lyon, and Matthew Albee FHWA-HRT-17-066
Safety Evaluation of Turning Movement Restrictions at Stop-Controlled Intersections Mar-18 Thanh Le, Frank Gross, Tim Harmon, and Kimberly Eccles FHWA-HRT-17-064
Safety Evaluation of Corner Clearance at Signalized Intersections Feb-18 Thanh Le, Frank Gross, Tim Harmon, and Kimberly Eccles FHWA-HRT-17-084
NCHRP Research Report 888: Development of Roundabout Crash Prediction Models and Methods Jan-18 Erin Ferguson, James Bonneson, Lee Rodegerdts, Nick Foster, Bhagwant Persaud, Craig Lyon, and Danica Rhoades
NCHRP Research Report 875: Guidance for Evaluating the Safety Impacts of Intersection Sight Distance Jan-18 Kimberly Eccles, Scott Himes, Kara Peach, Frank Gross, Richard J. Porter, Timothy J. Gates, and Christopher M. Monsere
NCHRP Research Report 892: Guidelines for Shielding Bridge Piers Jan-18 Malcolm H. Ray, Christine E. Carrigan, and Chuck A. Plaxico
NCHRP Research Report 881: Traffic Control Devices and Measures for Deterring Wrong-Way Movements Jan-18 Melisa D. Finley, Raul E. Avelar, Steve P. Venglar, H. Gene Hawkins, Jr., and Haitham Al-Deek
Safety Evaluation of Edge-Line Rumble Stripes on Rural Two-Lane Horizontal Curves Dec-17 Scott Himes, Frank Gross, Bhagwant Persaud, and Kimberly Eccles FHWA-HRT-17-069
Safety Evaluation of Cable Median Barriers in Combination with Rumble Strips on the Inside Shoulder of Divided Roads Aug-17 Raghavan Srinivasan, Bo Lan, Daniel Carter, Bhagwant Persaud, and Kimberly Eccles FHWA-HRT-17-070
NCHRP Web-Only Document 227: Design of Interchange Loop Ramps and Pavement/Shoulder Cross-Slope Breaks Jan-17 Darren J. Torbic, Lindsay M. Lucas, Douglas W. Harwood, Marcus A. Brewer, Eun Sug Park, Raul Avelar, Michael P. Pratt, Akram Abu-Odeh, Elizabeth Depwe, and Kimberly Rau
NCHRP Research Report 841: Development of Crash Modification Factors for Uncontrolled Pedestrian Crossing Treatments Jan-17 Charles Zegeer, Raghavan Srinivasan, Bo Lan, Daniel Carter, Sarah Smith, Carl Sundstrom, Nathan J. Thirsk, Craig Lyon, Bhagwant Persaud, John Zegeer, Erin Ferguson, and Ron Van Houten
Intersection Conflict Warning System Human Factors: Final Report Nov-16 Vaughan W Inman and Steven Jackson FHWA-HRT-16-061
Safety Evaluation of Wet-Reflective Pavement Markings Oct-15 Craig Lyon, Bhagwant Persaud, and Kimberly Eccles FHWA-HRT-15-065
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

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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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