A variety of research studies have been performed using data from HSIS. Many of the final reports prepared are now available electronically. A complete list of available publications is provided below.
|Title||Pub Date||Author||Report Number|
|Safety Effects of Horizontal Curve and Grade Combinations on Rural Two-Lane Highways||Jan-14||Karin M. Bauer, Douglas W. Harwood||FHWA-HRT-13-077|
|Development of a Speeding-Related Crash Typology||Apr-10||Council, F.M., M. Reurings, R. Srinivasan, S. Masten, and D. Carter||FHWA-HRT-10-024|
|Safety Evaluation of Lane and Shoulder Width Combinations on Rural, Two-Lane, Undivided Roads||Jun-09||Gross, F., P.P. Jovanis, K.A. Eccles, and K. Chen||FHWA-HRT-09-031|
|NCHRP Project 5-19, "Analysis of Safety Effects for the Presence of Roadway Lighting"||Jun-09||Donnell, E.T., V. Shankar, and R.J. Porter|
|NCHRP Report 5-19, "Analysis of Visual Performance Benefits from Roadway Lighting"||Jun-09||Bullough, J.D., M.S. Rea, and Y. Zhou|
|NCHRP 5-19, "Review of the Safety Benefits and Other Effects of Roadway Lighting"||Jun-09||Rae, M.S., J.D. Bullough, C.R. Fay, J.A. Brons, J.V. Derlofske, and E.T. Donnell|
|Low-Cost Safety Enhancements for Stop-Controlled and Signalized Intersections||May-09||FHWA||FHWA-SA-09-020|
|NCHRP Report 633: Impact of Shoulder Width and Median Width on Safety||Jan-09||Stamatiadis, N., J. Pigman, J. Sacksteder, W. Ruff, and D. Lord|
|NCHRP Report 641: Guidance for the Design and Application of Shoulder and Centerline Rumble Strips||Jan-09||Trobic, D.J., J.M. Hutton, C.D. Bokenkroger, K.M. Bauer, D.W. Harwood, D.K. Gilmore, J.M. Dunn, J.J. Ronchetto, E.T. Donnell, H.J. Sommer III, P. Garvey, B. Persaud, and C. Lyon|
|NCHRP Report 633: Impact of Shoulder Width and Median Width on Safety.||Jan-09||Stamatiadis, N., J. Pigman, J. Sacksteder, W. Ruff, and D. Lord|
|NCHRP Project 15-27, "Safety Impacts of Design Element Trade-Offs"||Jan-09||Stamatiadis, N.|
|Long Term Pavement Performance Computed Parameter: Frost Penetration||Nov-08||Selezneva, O.I., Y.J. Jiang, G. Larson, and T. Puzin||FHWA-HRT-08-057|
|Wildlife-Vehicle Collision Reduction Study: Best Practices Manual||Oct-08||Huijser, M.P., P. McGowen, A.P. Clevenger, and R. Ament|
|Safety Evaluation of Flashing Beacons at STOP-Controlled Intersections||Mar-08||Srinivasan, R., D.L. Carter, K.A. Eccles, B. Persaud, N.X. Lefler, C. Lyon, and R. Amjadi||FHWA-HRT-08-044|
|Safety Evaluation of STOP AHEAD Pavement Markings||Mar-08||Gross, F.B., R. Jagannathan, B.N. Persaud, C. Lyon, K. Eccles, N. Lefler, and R. Amjadi||FHWA-HRT-08-043|
|Cost Effective Safety Improvements for Two-Lane Rural Roads||Mar-08||Wang, Y., N.H. Nguyen, A.B.E. Levy, and Y. Wu||TNW2008-04|
|NCHRP Project 17-29, "Methodology to Predict the Safety Performance of Rural Multilane Highways"||Feb-08||Lord, D. (Principal Investigator, Texas A&M Reserach Foundation)|
|NCHRP Project 17-29, "Methodology to Predict the Safety Performance of Rural Multilane Highways"||Feb-08||Lord, D. (Principal Investigator, Texas A&M Research Institute)|
|NCHRP Report 615: Evaluation of the Use and Effectiveness of Wildlife Crossings||Jan-08||Bissonette, J.A. and P.C. Cramer|
|NCHRP Report 617: Accident Modification Factors for Traffic Engineering and ITS Improvements||Jan-08||Harkey, D.L., R. Srinivasan, J. Baek, F.M. Council, K. Eccles, N. Lefler, F. Gross, B. Persaud, C. Lyon, E. Hauer, and J.A. Bonneson|
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.