Turner-Fairbank Highway Research Center


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HSIS data are sometimes used in research studies that result in other types of finished products, such as dissertations, theses, and conference proceedings.

Title Pub Date Author
Development of Safety Performance Functions for Two-Lane Rural Highways in The State of Ohio Jan-21 Abdulrahman Faden and Deogratias Eustace
Analysis of Factors Affecting Traffic Accident Severity Based on Heteroskedasticity Ordinal Logit May-11 Zhangcun Yan, Xiaozhao Lu, and Wanxin Hu
The Safety Impact of Raising Speed Limit on Rural Freeways In Ohio Jan-20 Oluwaseun Olufowobi
Passenger Vehicle-Motorcycle Pre-Crash Trajectory Reconstruction Results Based on an Extended Application of the NHTSA-Honda-DRI ACAT Safety Impact Methodology Jan-18 R Michael Van Auken, John Lenkeit, and Terry Smith
Risk Factors Affecting Crash Injury Severity by Work Zone Area Jan-18 Krupanidhi Koilada, Srinivas S Pulugurtha, and Ajinkya S Mane
Evaluating the Interactive Effects of Traffic Volumes and Access Density on Crash Frequency Jan-17 Ali Mohammed Alsubeai
Intersection Lighting Impacts on Nighttime Crashes Reduction and Safety Improvement Jan-16 Mohammed Said Obeidat and Malgorzata J Rys
Modeling of guide sign illumination and retroreflectivity to improve driver’s visibility and safety Jan-15 Mohammed Obeidat
The impacts of illumination on nighttime safety at roundabouts Jan-15 Franklin E Gbologah
Nighttime Safety and Pavement Marking Retroreflectivity on Two-Lane Highways: Revisited with North Carolina Data Jan-15 Paul J Carlson, Raul Avelar, Eun Sug Park, and Don Kang
Influence of seasonal temperature on pavement reliability performance: A case study May-11 Roya Amjadi, Jim Sherwood, and Gerardo Flintsch
A framework for developing road risk indices using quantile regression based crash prediction model Jan-11 Hui Wu
Reliability-based safety evaluation of traffic on rural highway Jan-11 Feng Chen
Safety Evaluation of Transverse Rumble Strips on Approaches to Stop Controlled Intersections in Rura Jan-10 Srinivasan, R., Baek, J., and Council, F.
A Methodology to Explore the Relationship Between Pavement Marking Retroreflectivity and Traffic Cra Jan-09 Donnell, E., V. Karwa, and S. Sathyanarayanan
Collision Prediction Models for Three-Dimensional Two-Lane Highways: I. Horizontal Curves Jan-09 Easa, S. and Q. You
Collision Prediction Models for Three-Dimensional Two-Lane Highways: II. Horizontal Tangents Jan-09 Easa, S. and Q. You
Application of Bayesian Statistics to Identify Highway Sections with Atypically High Rates of Median Jan-09 Davis, G., H. Xiong, and H. Tao
The Benefits of Pavement Markings: A Renewed Perspective Based on Recent and Ongoing Research Jan-09 Carlson, P.J., E.S. Park, and C.K. Anderson
No-Fault Insurance and Automobile Accidents Oct-08 Heaton, P. and E. Helland

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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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