Turner-Fairbank Highway Research Center


Journal Citations

Many of the studies conducted using HSIS data result in publication in professional journals, conference proceedings, research records, and other peer-reviewed documents.

Title Pub Date Author
Accident Models for Two-Lane Rural Segments and Intersections Sep-98 Andrew Vogt and Joe Bared
Accident Rates Using HSIS Yusuf M. Mohamedshah, and Amy R. Kobls
Accident Relationships of Roadway Width on Low-Volume Roads Jan-94 Zegeer, C.V., J.R. Stewart, F.M. Council, and T.R. Neuman
Adjustment for Maximum Likelihood Estimate of Negative Binomial Dispersion Parameter Jan-08 Park, B. and D. Lord
Analysis of Effects of Pavement Marking Retroreflectivity on Traffic Crash Frequency on Highways in Jan-09 Donnell, E.T., V. Karwa, and S. Sathyanarayanan
Analysis of Road Crash Frequency with Spatial Models Jan-09 guero-Valverde, J. and P.P. Jovanis
Application of Innovative Time Series Methodology to Relationship Between Retroreflectivity of Pavem Jan-07 Masliah, M., G. Bahar, and E. Hauer
Applying the ordered Probit Model to Injury Severity in Truck-Passenger Car Rear-End Collisions Sep-98 Chandler S. Duncan, Asad J. Khattak, and Forrest M. Council
Appraisal of the Interactive Highway Safety Design Model's Crash Prediction and Design Modules: Case Feb-09 Donnell, E.T., F. Gross, B.P. Stodart, and K.S. Opiela
Association of Median Width and Highway Accident Rates Oct-93 Mathew W. Knuiman, Forrest M. Council, and Donald W. Reinfurt
Bayesian Multivariate Poisson Regression for Models of Injury Count, by Severity Jan-06 Ma, J. and K.M. Kockelman
Comparative Performance of Barrier and End Treatment Types Using the Longitudinal Barrier Special St Jan-93 Hunter, W.W., J.R. Stewart, and F.M. Council
Comparison of the Safety of Lighting Options on Urban Freeways Michael S. Griffith
Crash Prediction Models for Intersections on Rural Multilane Highways: Differences by Collision Type Jan-07 Jonsson, T., J.N. Ivan, and C. Zhang
Crash Reduction Following Installation of Centerline Rumble Strips on Rural Two-Lane Roads Nov-04 Persaud, B.N., R.A. Retting, and C.A. Lyon
Difficulties with Quasi-Induced Exposrue when Speed Varies Systematically by Vehicle Type Jul-07 Jiang, X. and R.W. Lyles
Effects of a Towaway Reporting Threshold on Crash Analysis Results Sep-98 Charles V. Zegeer, Herman F. Huang, J. Richard Stewart, Ron Pfefer and Jun Wang
Effects of Air Bags on Severity Indices for Roadside Objects Jan-97 Forrest M. Council, Yusuf M. Mohamedshah, and J. Richard Stewart
Effects of Speed Limit Increases on Crash Injury Severity: Analysis of Single-Vehicle Crashes on Nor Oct-99 Henry Renski, Asad J. Khattak, and Forrest M. Council
Effects of Varying Dispersion Parameter of Poisson-Gamma Models on Estimation of Confidence Interval Jan-08 Geedipally, S.R. and D. Lord

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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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