Standard form of classification for worlds, rated in terms of relative danger.
As a service to spacefarers, the Traveller's Aid Society has established a system of Travel Zone ratings which colour-code areas in the Imperium (and outside the Imperium) to indicate the degree of danger a world presents to the ordinary traveller.
By assumption, the entire Imperium is classed Green (safe) unless stated otherwise. Some areas are coded Amber to indicate caution is necessary; reasons for such ratings include unstable local governments, xenophobic populations, and uncertain or extreme local conditions. The code Red is reserved for dangerous areas; Imperial interdictions, wars, and quarantined worlds are routinely classified as Red Zones.
(ADV-1, 1104; ADV-3, 1106; SUPP-11: p25, 1107; MT-ENCYC: p42, 1120)
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