Hotspot identification : a full Bayesian hierarchical modeling approach
Huang, Helai, Chin, Hoong Chor, & Haque, Md. Mazharul (2009) Hotspot identification : a full Bayesian hierarchical modeling approach. In 18th International Symposium on Transportation and Traffic Theory (ISTTT18), Springer, Hong Kong, pp. 441-462.
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This study proposes a full Bayes (FB) hierarchical modeling approach in traffic crash hotspot identification. The FB approach is able to account for all uncertainties associated with crash risk and various risk factors by estimating a posterior distribution of the site safety on which various ranking criteria could be based. Moreover, by use of hierarchical model specification, FB approach is able to flexibly take into account various heterogeneities of crash occurrence due to spatiotemporal effects on traffic safety. Using Singapore intersection crash data(1997-2006), an empirical evaluate was conducted to compare the proposed FB approach to the state-of-the-art approaches. Results show that the Bayesian hierarchical models with accommodation for site specific effect and serial correlation have better goodness-of-fit than non hierarchical models. Furthermore, all model-based approaches perform significantly better in safety ranking than the naive approach using raw crash count. The FB hierarchical models were found to significantly outperform the standard EB approach in correctly identifying hotspots.
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|Item Type:||Conference Paper|
|Keywords:||full Bayes (FB) hierarchical, hotspot identification|
|Subjects:||Australian and New Zealand Standard Research Classification > MATHEMATICAL SCIENCES (010000) > STATISTICS (010400) > Applied Statistics (010401)|
|Divisions:||Current > Research Centres > Centre for Accident Research & Road Safety - Qld (CARRS-Q)|
Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Deposited On:||29 Jun 2012 08:43|
|Last Modified:||22 Mar 2013 13:41|
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