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==Objectives==
General objective: characterize interaction similarities to better predict safety (expected number of accidents) and understand collision processes and factors

Additional specific objectives include the definition and investigation of exposure in terms of interaction, and a way to characterize safe and normal interactions in facilities where the right of way involves explicit and aware road user interaction

==Methodology==
An initial avenue is to define interactions in a way that includes conflicts and accidents. An example is the definition used in older work as two road users being simultaneously within some predefined distance. Another is "all events where the minimum time to collision" was below some threshold, which includes accidents and probably most conflict definitions.

==Resources==
* General resources [[Surrogate_Measures_of_Safety#Resources]]
* N. Saunier and M. G. Mohamed. Clustering surrogate safety indicators to understand collision processes. In Transportation Research Board Annual Meeting Compendium of Papers, 2014. 14-2380 http://n.saunier.free.fr/saunier/stock/saunier14clustering.pdf
* R. Elvik, Towards a general theory of the relationship between exposure and risk https://www.toi.no/getfile.php?mmfileid=36724