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A warning triangle is, together with warning lights, used in order to secure a traffic accident site. The legal rules in the individual states partly order a warning triangle to be brought in the vehicle (in Germany according to § 53a StVZO).
The warning triangle consists of three reflective beams, similar to a cat's eye, and a stable foot.
Except from this form, which is prescribed in road traffic, there are also collapsible signals or triangles, used by emergency services, but also for short road closures by other firms with workers in the road, perhaps gasworks or power plants. Collapsible signals also have further inscriptions, as the example photo shows. As they are collapsible, they need smaller space in vehicles than fixed boards.