Safety and ease of shipping
From BAWiki
Definition
Security describes a process which is free from risk of impairment or is regarded as risk-free, and includes personal safety and property protection; Lightness refers to the absence of any specific difficulties in guiding and navigating a vessel, the higher the lightness, the higher the security. The lightness can for instance be influenced by fairway width, turning radius, visibility, information.
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Source
Glossar für das Forschungsprogramm KLIWAS (deutsch-englisch), Mehling, Andrea et al., Bundesanstalt für Gewässerkunde, Koblenz 2011