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Title: Comparison of two simulation approaches to safety assessment : cellular automata and SSAM
Authors: Chai, Chen
Wong, Yiik Diew
Keywords: Traffic Safety
Simulation Models
Issue Date: 2015
Source: Chai, C., & Wong, Y. D. (2015). Comparison of two simulation approaches to safety assessment : cellular automata and SSAM. Journal of Transportation Engineering, 141(6), 05015002-.
Series/Report no.: Journal of Transportation Engineering
Abstract: A 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.
ISSN: 0733-947X
DOI: 10.1061/(ASCE)TE.1943-5436.0000766
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: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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