HSIS data are sometimes used in research studies that result in other types of finished products, such as dissertations, theses, and conference proceedings.
|Safety Evaluation of Transverse Rumble Strips on Approaches to Stop Controlled Intersections in Rura||Jan-10||Srinivasan, R., Baek, J., and Council, F.|
|A Methodology to Explore the Relationship Between Pavement Marking Retroreflectivity and Traffic Cra||Jan-09||Donnell, E., V. Karwa, and S. Sathyanarayanan|
|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|
|Application of Bayesian Statistics to Identify Highway Sections with Atypically High Rates of Median||Jan-09||Davis, G., H. Xiong, and H. Tao|
|The Benefits of Pavement Markings: A Renewed Perspective Based on Recent and Ongoing Research||Jan-09||Carlson, P.J., E.S. Park, and C.K. Anderson|
|No-Fault Insurance and Automobile Accidents||Oct-08||Heaton, P. and E. Helland|
|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.|
|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|
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.
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.
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.