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 |
| Zero Tolerance: Four States Experience | John Lacey and Ralph Jones | DOT-HS-809-053 | |
| Wildlife-Vehicle Collision Reduction Study: Report to Congress | Jan-07 | Huijser, M.P., P.T. McGowen, J. Fuller, A. Hardy, and A. Kociolek | |
| Wildlife-Vehicle Collision Reduction Study: Best Practices Manual | Oct-08 | Huijser, M.P., P. McGowen, A.P. Clevenger, and R. Ament | |
| Traffic Operations Control for Older Drivers. Final Report | Mar-95 | R. Knoblauch, M. Nitzburg, D. Reinfurt, F. Council, C. Zegeer, and C. Popkin | FHWA-RD-94-119 |
| Study of Accidents at Signalized Intersections Phase I Final Report | ereen J. Wolverton and John J. Monce | ||
| Study Designs for Passing Sight Distance Requirements: Final Report | Apr-92 | Warren Hughes, Sarath Joshua, and Hugh McGee | FHWA-RD-91-078 |
| Stopping Sight Distance - II | Kay Fitzpatick | ||
| Speed and Safety in North Carolina | Aug-13 | Libby Thomas, Raghavan Sirnivasan, Bo Lan, Wiliam Hunter, Carol Martell, and Eric Rodgman | |
| Spatially Disaggregate Panel Models of Crash and Injury Counts: The Effect of Speed Limits and Desig | Jan-03 | Kweon, Y.J. and K.M. Kockelman | |
| Small Target Visibility | Jan-97 | Doug Mace | |
| Safety Impacts of Pavement Edge Drop-offs | Sep-06 | Hallmark, S.L., D. Veneziano, T. McDonald, J. Graham, R. Patel, and F.M. Council | |
| Safety Evaluation of Wet-Reflective Pavement Markings | Oct-15 | Craig Lyon, Bhagwant Persaud, and Kimberly Eccles | FHWA-HRT-15-065 |
| Safety Evaluation of Turning Movement Restrictions at Stop-Controlled Intersections | Mar-18 | Thanh Le, Frank Gross, Tim Harmon, and Kimberly Eccles | FHWA-HRT-17-064 |
| 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 |
| Safety Evaluation of Red-Light Cameras | Apr-05 | Council, F.M., B.N. Persaud, K.A. Eccles, C. Lyon, and M.S. Griffith | FHWA-HRT-05-048 |
| 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 |
| Safety Evaluation of Installing Center Two-Way Left-Turn Lanes on Two-Lane Roads | Dec-07 | Persaud, B., C. Lyon, K.A. Eccles, N.X. Lefler, D.L. Carter, and R. Amjadi | FHWA-HRT-08-042 |
| Safety Evaluation of Improved Curve Delineation | Sep-09 | Raghavan Srinivasan, Jongdae Baek, Daniel Carter, Bhagwant Persaud, Craig Lyon, Kimberly Eccles, Frank Gross, and Nancy Lefler | FHWA-HRT-09-045 |
| Safety Evaluation of Horizontal Curve Realignment on Rural, Two-Lane Road | Apr-18 | Raghavan Srinivasan, Daniel Carter, Craig Lyon, and Matthew Albee | FHWA-HRT-17-066 |
| 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 |
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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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.
