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
Estimating the Variance in Before-After Studies Jan-07 Ye, Z. and D. Lord
The Effects of Freeway Management Systems and Motorist Assistance Patrols on the Frequency of Report Todd Olmstead
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
Safety Evaluation of Transverse Rumble Strips on Approaches to Stop Controlled Intersections in Rura Jan-10 Srinivasan, R., Baek, J., and Council, F.
Work Zone Safety and Mobility Issues: Case Study on Dan Ryan Reconstruction Project Jan-08 Shi, J.
The Effect of Infrastructure and Demographic Change on Traffic-related Fatalities and Crashes: A Ca Robert B. Noland, and Lyoong Oh
Safety of U-Turns at Unsignalized Median Openings on Urban and Suburban Arterials Jan-04 Potts, I.B., D.W. Harwood, H.S. Levinson, and J. Gluck
Safety Assessment of the Interchange Spacing on Urban Freeways: Enhanced Models Jan-07 Pilko, P., J.G. Bared, P.K. Edara, and T. Kim
Safety Assessment of Interchange Spacing on Urban Freeways: Enhanced Models Jan-07 Pilko, P., J.G. Bared, P.K. Edara, and T. Kim
Weather-Related Crashes on Public Land Aug-07 Moore, L.
Determining the Extent and Characteristics of Overrepresentation of Large Truck Crashes in Daytime a Dec-07 Mokkapati, N.
Evaluation of Alternative Hyper-priors for Bayesian Road Safety Analysis Jan-08 Miranda-Moreno, L.F., D. Lord, and L. Fu
Safety Evaluation of Continues Shoulder Rumble Strips Installed on Freeways Michael S. Griffith
Bayesian Multivariate Poisson-Lognormal Regression for Crash Prediction on Rural Two-Lane Highways. Jan-07 Ma, J., K.M. Kockelman, and P. Damien
Anticipating Injury & Death: controlling for New Variables on Southern California Highways Jan-04 Ma, J. and K.M. Kockelman
Exploratory Analysis of Relationship between the Number of Lanes and Safety on Urban Freeways Jan-08 Kononov, J., B. Bailey, and B.K. Allery
Freeway Speeds and Speed Variations Preceding Crashes, Within and Across Lanes Jan-04 Kockelman, K.M. and J. Ma
Numerical Examination of Freeway Rear-End Accidents Considering Mechanism of Accident Occurrence Jan-06 Kim, J.K., G. Ulfarsson, and Y. Wang
Investigation of Appropriate Objects Stopping Sight Distance Dec-92 Karen B. Kahl
The Application of an Improved Highway Safety Evaluation Jun Wang

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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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