Sign J20: Warning for a slippery road

Legal meaning

Slippery road.

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

Shape and colour

Triangle with a red rim and a black car with skid marks: warning of a slippery road.

Where the sign stands

Outside the built-up area 100–150 m before the slick stretch, inside it shorter, on the right; a plate often names the cause.

What the exam asks about this sign

The exam asks what to do at a slippery road: take speed off before the slick stretch, no abrupt steering, braking or accelerating, and keep more distance. Trap: candidates pick 'brake hard at the sign'; braking on a slick road is exactly what causes the skid.

Often confused with

• Warning for risk of ice or snow J36 — Ice or snow: a specific cause of slipperiness.
• Warning for an uneven or poor road surface J1 — Bad road surface: bumpy, not slick.
• Warning for reduced visibility because of snow, rain or fog J35 — Poor visibility.