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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
A framework for developing road risk indices using quantile regression based crash prediction model Jan-11 Hui Wu
A Methodology to Explore the Relationship Between Pavement Marking Retroreflectivity and Traffic Cra Jan-09 Donnell, E., V. Karwa, and S. Sathyanarayanan
Analysis of Factors Affecting Traffic Accident Severity Based on Heteroskedasticity Ordinal Logit May-11 Zhangcun Yan, Xiaozhao Lu, and Wanxin Hu
Anticipating Injury & Death: controlling for New Variables on Southern California Highways Jan-04 Ma, J. and K.M. Kockelman
Application of Bayesian Statistics to Identify Highway Sections with Atypically High Rates of Median Jan-09 Davis, G., H. Xiong, and H. Tao
Appraisal of the Interactive Highway Safety Design Model's Crash Prediction and Design Consistency M Jan-07 Donnell, E.T., B.P. Stodart, and F. Gross
Bayesian Multivariate Poisson-Lognormal Regression for Crash Prediction on Rural Two-Lane Highways. Jan-07 Ma, J., K.M. Kockelman, and P. Damien
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
Correlation of truck accidents with highway geometry Jan-91 Mohamedshah, Yusaf M
Determining the Extent and Characteristics of Overrepresentation of Large Truck Crashes in Daytime a Dec-07 Mokkapati, N.
Development of a Web-Based Expert System for Setting Speed Limits in Speed Zones Jan-08 Srinivasan, R., D.L. Harkey, D. Tharpe, R. Sumner, and M.R. Parker
Development of Safety Performance Functions for Two-Lane Rural Highways in The State of Ohio Jan-21 Abdulrahman Faden and Deogratias Eustace
EB Analysis in the Micro Optimization of the Improvement Benefits of Highway Segments for Models wit Jan-07 Banihashemi, M.
Estimating the Variance in Before-After Studies Jan-07 Ye, Z. and D. Lord
Evaluating the Interactive Effects of Traffic Volumes and Access Density on Crash Frequency Jan-17 Ali Mohammed Alsubeai
Evaluation of Alternative Hyper-priors for Bayesian Road Safety Analysis Jan-08 Miranda-Moreno, L.F., D. Lord, and L. Fu
Evaluation of the Effectiveness of Shoulder Rumble Strips on Rural Multi-lane Divided Highways in Mi Jan-04 Carrasco, O., J. McFadden, and P. Chandhok
Exploratory Analysis of Relationship between the Number of Lanes and Safety on Urban Freeways Jan-08 Kononov, J., B. Bailey, and B.K. Allery
Factors Contributing to Pedestrian and Bicycle Crashes on Rural Highways Jan-07 Carter, D.L. and F.M. Council

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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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