warning triangle

noun

noun

Automotive, Transport, Vehicles A triangle made of (usually) red reflective material, used to warn other road users of a broken-down vehicle.

If your vehicle breaks down, [...] put a warning triangle on the road at least 45 metres (147 feet) behind your broken-down vehicle on the same side of the road.2007, The Official Highway Code, The Stationery Office, →ISBN, page 91:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.