McArdle (1990), ‘The safety impact of the 65 mph speed limit: A case study using Alabama accident records’, Journal of Safety Research, 21 (4), 125–139, (90)90020-c.Ĭastillo-Manzano, J. Czewski (1998), ‘Evaluation of Michigan 70-mph Speed Limit’, Transportation Research Record: Journal of the Transportation Research Board, 1640 (1), 37–46. Wells (1989), ‘The mortality consequences of raising the speed limit to 65 mph on rural interstates’, American Journal of Public Health, 79 (10), 1392–1395. (1998), ‘Speed-accident relationships on European roads’, presented at 9th International Conference on Road Safety in Europe (Bergisch Gladbach, Germany: 21–23 September 1998),, accessed 22 October 2022.īaum, H. Mannering (2016), ‘The effect of speed limits on drivers' choice of speed: A random parameters seemingly unrelated equations approach’, Analytic Methods in Accident Research, 10, 1–11. Savolainen, Michigan State University, USAĪASHTO (2018), A Policy on Geometric Design of Highways and Streets (Washington D.C., USA: American Association of State Highway and Transportation Officials) 7th edition.Īnastasopoulos, P. Jashami has worked on externally funded research from agencies including the National Highway Traffic Safety Administration, the Federal Highway Administration, the Pacific Northwest Transportation Consortium (PacTrans), and various State Departments of Transportation which has led to the publication of more than 35 peer-reviewed journal articles, conference papers, and technical reports.ĬRediT statement: Formal analysis, Validation, Visualization, Writing-review & editing. During the course of his academic career, Dr. His research has been focused on topics related to transportation safety, human factors, driving & bicycling simulators, autonomous vehicle simulation, and data analysis. Prior to his appointment at OSU, Hisham worked as a Research Associate in the Department of Civil and Environmental Engineering at Michigan State University (MSU). Hisham Jashami is an Assistant Professor (Sr Res) of Transportation Engineering in the School of Civil and Construction Engineering at Oregon State University (OSU) and a certified Road Safety Professional Engineer. The results provide important insights into the nature of the relationship between speed and safety and will help to guide subsequent speed limit policy decisions.ĭr. Several site-specific characteristics were also found to be strong predictors of crash frequency. Interestingly, mean speeds were found to be negatively associated with crash frequency, while the standard deviation of speed was found to exhibit a positive relationship. The results show that the locations where the speed limits were increased experienced a 5% increase in crashes, while a marginal reduction in crashes was observed where speed limits did not increase. The impacts of the speed limit increase on safety were evaluated by estimating random effects negative binomial models as part of a case-control before-after study design. These data are merged with pertinent roadway data, as well as police-reported crash data at various levels of injury severity. Speed data were obtained for the Michigan rural freeway network through probe vehicles. The maximum speed limits for trucks were also increased from 60 to 65 mph on all freeways state-wide at this same time. The speed limit increases in Michigan occurred between May 1 and June 12 of 2017, when the maximum speed limits were increased from 70 to 75 mph on approximately 600 miles of freeways. To this end, the present study evaluates the effects of increasing speed limits on the safety of rural limited access freeways while accounting for contemporaneous changes in the speed profiles of these same roadways. However, research has been more limited as to the direct relationship between speed and safety. These increases have also generally coincided with increases in both the frequency and severity of crashes. Research has consistently shown speeds to increase following speed limit increases. Maximum speed limits continue to be an important policy issue. 75 mph, crash frequency modelling, rural freeway, speed limit increase, speed variance Abstract
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