Identification of Risk Areas

As far as possible, all work with and storage of chemical carcinogens should be segregated from other work and storage places and, whenever possible, situated in laboratories or places reserved only for this purpose. 

When experiments involving chemical carcinogens are left in progress, the name and telephone number of the responsible officer in charge of the experiment should be left attached to the sign indicating the hazard. 

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However most of these methods rely on scarce accident statistics, predictive traffic flow methods (Fowler Sorgard 2000) or simulation techniques (Goerlandt Kujala 2011), which necessitate assumptions on what constitutes a vessel encounter. This may lead to an unreliable identification of risk areas, as discussed in (Goerlandt Kujala 2014). Therefore, the method presented in this paper utilizes non-collision information from actually observed traffic to assess system risk and avoid assumptions, which may question the reliability and validity of the method. 

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