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Markings that put a record on the object rather than in a file, because a file cannot stop somebody digging, climbing or picking up the wrong sling. Each carries a default that catches people out: an untagged scaffold is uninspected rather than unlabelled, a locate mark is a zone rather than a line, warning tape means a service is probably below while no tape means nothing at all, and a colour code is national or site-specific rather than universal.
Spray-painted colours on a road surface, each standing for a buried service.
Sprayed letters and figures giving a buried service's size, material and depth.
Coloured printed tape laid above a buried cable or pipe as a last warning.
Cast lettering and a load class on a manhole or inspection cover.
A coloured tag at a scaffold access point recording its inspection status.
A coloured band or tag showing the period in which equipment was last inspected.
A small dated sticker on a plug or lead recording an electrical safety check.
Helmet colours identifying roles on a construction site.
A horizontal bar above a broad arrow, cut into stone as a height reference.
A three-pronged arrow marking British government property.