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dc.contributor.authorChai, Chenen
dc.contributor.authorWong, Yiik Diewen
dc.identifier.citationChai, C., & Wong, Y. D. (2015). Comparison of two simulation approaches to safety assessment : cellular automata and SSAM. Journal of Transportation Engineering, 141(6), 05015002-.en
dc.description.abstractA study is conducted to compare two simulation methods for estimating conflicts between road users. An improved cellular automata (CA) model is proposed to estimate the occurrences and severity of traffic conflicts (both vehicle–vehicle and vehicle–pedestrian) at signalized intersections. The proposed CA model is compared with a calibrated method of a surrogate safety assessment model (SSAM) based on Vissim. Simulated conflicts from both methods are compared with observed vehicle conflicts from automated vehicle tracking for both occurrences and severity. Simulation results show that the CA approach is able to replicate realistic conflicts. However, SSAM tends to overestimate occurrences and underestimate the severity of rear-end and lane-change conflicts. SSAM has also been found to overestimate the severity of crossing conflicts. Furthermore, the proposed CA model is able to estimate conflicts between vehicles and pedestrians.en
dc.description.sponsorshipMOE (Min. of Education, S’pore)en
dc.format.extent36 p.en
dc.relation.ispartofseriesJournal of Transportation Engineeringen
dc.rights© 2015 American Society of Civil Engineers. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Transportation Engineering, American Society of Civil Engineers. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].en
dc.subjectTraffic Safetyen
dc.subjectSimulation Modelsen
dc.titleComparison of two simulation approaches to safety assessment : cellular automata and SSAMen
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen
dc.contributor.researchCentre for Infrastructure Systemsen
dc.description.versionAccepted versionen
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