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• W2213990620 abstract "In traffic safety studies, crash frequency modeling of total crashes is the cornerstone before proceeding to more detailed safety evaluation. The relationship between crash occurrence and factors such as traffic flow and roadway geometric characteristics has been extensively explored for a better understanding of crash mechanisms. In this study, a multi-level Bayesian framework has been developed in an effort to identify the crash contributing factors on an urban expressway in the Central Florida area. Two types of traffic data from the Automatic Vehicle Identification system, which are the processed data capped at speed limit and the unprocessed data retaining the original speed were incorporated in the analysis along with road geometric information. The model framework was proposed to account for the hierarchical data structure and the heterogeneity among the traffic and roadway geometric data. Multi-level and random parameters models were constructed and compared with the Negative Binomial model under the Bayesian inference framework. Results showed that the unprocessed traffic data was superior. Both multi-level models and random parameters models outperformed the Negative Binomial model and the models with random parameters achieved the best model fitting. The contributing factors identified imply that on the urban expressway lower speed and higher speed variation could significantly increase the crash likelihood. Other geometric factors were significant including auxiliary lanes and horizontal curvature." @default.
• W2213990620 created "2016-06-24" @default.
• W2213990620 creator A5002323402 @default.
• W2213990620 creator A5040847417 @default.
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• W2213990620 date "2016-03-01" @default.
• W2213990620 modified "2023-10-16" @default.
• W2213990620 title "Multi-level Bayesian safety analysis with unprocessed Automatic Vehicle Identification data for an urban expressway" @default.
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• W2213990620 doi "https://doi.org/10.1016/j.aap.2015.12.007" @default.
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