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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
Safety Evaluation of Installing Center Two-Way Left-Turn Lanes on Two-Lane Roads Jan-08 Lyon, C., B.N. Persaud, N.X. Lefler, D.L. Carter, and K.A. Eccles
Safety Evaluation of Flashing Beacons at Stop-Controlled Intersections Jan-08 Srinivasan, R., D.L. Carter, B.N. Persaud, K.A. Eccles, and C. Lyon
Safety Effectiveness of "Stop Ahead" Pavement Markings Jan-08 Gross, F., R. Jagannathan, C. Lyon, and K. Eccles
Relationships Between Safety and Both Congestion and Number of Lanes on Urban Freeways Jan-08 Kononov, J., B. Bailey, and B.K. Allery
Predicting motor vehicle collisions using Bayesian neural network models: An empirical analysis Sep-07 Xie, Y., D. Lord, and Y. Zhang
Difficulties with Quasi-Induced Exposrue when Speed Varies Systematically by Vehicle Type Jul-07 Jiang, X. and R.W. Lyles
Estimating Safety Benefits of Shoulder Rumble Strips on Two-Lane Rural Highways in Minnesota: Empiri Jan-07 Patel, R., F. Council, and M. Griffith
Crash Prediction Models for Intersections on Rural Multilane Highways: Differences by Collision Type Jan-07 Jonsson, T., J.N. Ivan, and C. Zhang
Multivariate Poisson-Lognormal Models for Jointly Modeling Crash Frequency by Severity Jan-07 Park, E.S. and D. Lord
Modeling the Probability of Freeway Rear-End Crash Occurrence Jan-07 Kim, J.K., Y. Wang, and G.F. Ulfarsson
Application of Innovative Time Series Methodology to Relationship Between Retroreflectivity of Pavem Jan-07 Masliah, M., G. Bahar, and E. Hauer
Turning Young Drivers into Survivors Sep-06 Opiela, K.S., B.M. Sant,and J.A. Childers
Use of Propensity Score Matching Method and Hybrid Bayesian Method to Estimate Crash Modification Fa Jan-06 Davis, G.A. and N. Aul
Part 5: Surface Transportation Weather: Development of Roadway Weather Severity Index Jan-06 Strong, C. and Y. Shvetsov
Bayesian Multivariate Poisson Regression for Models of Injury Count, by Severity Jan-06 Ma, J. and K.M. Kockelman
Real World Crash Evaluation of Vehicle Stability Control (VSC) Technology Jan-05 Bahouth, G.
Safety Effects of Speed Limit Changes: Use of PanelModels, Including Speed, Use, and Design Variable Jan-05 Kockelman, K.M. and Y.J. Kweon
Safety of U-Turns at Unsignalized Median Openings: Some Research Findings Jan-05 Levinson, H.S., I.B. Potts, D.W. Harwood, J. Gluck, and D.J. Torbic
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
Method for Priority-Ranking and Expanding Freeway Service Patrols Jan-04 Khattak, A., N. Rouphail, K. Monast, and J. Havel

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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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