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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
Evaluation of Alternative Hyper-priors for Bayesian Road Safety Analysis Jan-08 Miranda-Moreno, L.F., D. Lord, and L. Fu
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
Optimization of Network Safety Improvements Using Empirical Bayes Analysis for Models with Accident Jan-08 Banihashemi, M.
Exploratory Analysis of Relationship between the Number of Lanes and Safety on Urban Freeways Jan-08 Kononov, J., B. Bailey, and B.K. Allery
Work Zone Safety and Mobility Issues: Case Study on Dan Ryan Reconstruction Project Jan-08 Shi, J.
Use of single vehicle collisions to model fatigue-related crashes on rural two-lane highways Jan-08 Xu Lin
Determining the Extent and Characteristics of Overrepresentation of Large Truck Crashes in Daytime a Dec-07 Mokkapati, N.
Weather-Related Crashes on Public Land Aug-07 Moore, L.
Risk Factors for Trucks on Freeways Aug-07 Amjadi, R., J. Fife, C. Tan, and G. Davis
Identification of High Car-Truck Crash Corridors on North Carolina Interstate Roadways Mar-07 Council, F.M., R. Srinivasan, and B. Hejazi
Safety Assessment of the Interchange Spacing on Urban Freeways: Enhanced Models Jan-07 Pilko, P., J.G. Bared, P.K. Edara, and T. Kim
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
EB Analysis in the Micro Optimization of the Improvement Benefits of Highway Segments for Models wit Jan-07 Banihashemi, M.
Safety Assessment of Interchange Spacing on Urban Freeways: Enhanced Models Jan-07 Pilko, P., J.G. Bared, P.K. Edara, and T. Kim
Estimating the Variance in Before-After Studies Jan-07 Ye, Z. and D. Lord
Bayesian Multivariate Poisson-Lognormal Regression for Crash Prediction on Rural Two-Lane Highways. Jan-07 Ma, J., K.M. Kockelman, and P. Damien
Factors Contributing to Pedestrian and Bicycle Crashes on Rural Highways Jan-07 Carter, D.L. and F.M. Council
Safety Impacts of Interchange Spacing on Urban Freeways Jan-06 Bared, J.G., P. Edara, and T. Kim
Safety Impacts of Differential and Uniform Car-Truck Speed Limits on Illinois and North Carolina Int Jan-06
Identifying Secondary Crash Characteristics for California Highway System Jan-06 Hirunyanitiwattana, W. and S. Mattingly

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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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