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- W644442414 abstract "A great deal of research and resources were focused on the development of the predictive methods provided in Part C of the Highway Safety Manual (HSM). Despite these efforts, some states were still hesitant to begin implementing crash prediction due a lack of research validating the accuracy of these methods in practical application. To address this gap, the Kansas Department of Transportation (KDOT) commissioned this study to analyze both the accuracy and the practicality of using the HSM rural two-lane predictive methods on Kansas highways. This study was focused on analyzing the predictive methods in a manner that was most consistent with how they would be utilized in the KDOT project delivery process. As part of that research multiple methods for calibrating the rural two-lane segment safety performance function (SPF) were analyzed. First, all of the methods published in the HSM were analyzed to determine their accuracy. The calibrated predictions showed significant improvements versus the uncalibrated predictions and were extremely accurate when analyzed at the aggregate level. In an effort to improve the crash prediction accuracy, alternative calibration methods were considered and analyzed. These alternatives included several linear calibration methods that addressed variables that have shown a positive correlation to highway crashes in Kansas in previous research, but are not considered in the HSM. While the linear calibration methods did not perform as well on the aggregate level, they did show improvement on the project level. Ultimately, the analysis of the HSM rural two-lane segment predictions showed a favorable accuracy and has been recommended for inclusion in KDOT’s safety evaluation toolbox at the project level." @default.
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- W644442414 date "2012-01-01" @default.
- W644442414 modified "2023-09-23" @default.
- W644442414 title "Calibration of the Highway Safety Manual Prediction Method for Rural Kansas Highways" @default.
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