Sign J37: Warning: a danger not indicated by another sign.

Legal meaning

Danger (the nature of the danger is stated on the supplementary plate).

Source: RVV 1990 annex 1 · checked 2026-10-23

Shape and colour

Triangle with a red rim and a black exclamation mark: warning of a danger named on the plate.

Where the sign stands

Outside the built-up area 100–150 m before the danger, inside it shorter, on the right; almost always with a plate.

What the exam asks about this sign

The exam asks what to do at this sign: slow down and read the plate, because it names the danger (for example crossing toads, low-flying aircraft, a narrowing). Without a plate expect any danger. Trap: candidates think the sign is always a stop order or a speed limit.

Often confused with

• Warning for danger of accidents J34 — Accident: a specific danger.
• Warning for road works ahead J16 — Roadworks.
• Warning that queues are likely J33 — Queue.