Sign J38: Warning for a road bump (speed hump)

Legal meaning

Speed hump.

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

Shape and colour

Triangle with a red rim and a black bump in the surface: warning of a speed hump.

Where the sign stands

On every approach of a junction with a raised table or hump, one warning distance before it.

What the exam asks about this sign

The question is what to do at a speed hump: reduce speed until you can take the hump without jolting, usually around 30 km/h; a plate may give an advisory speed. Trap: candidates think the hump gives a priority rule or that they may stop on it.

Often confused with

• Warning for an uneven or poor road surface J1 — Bad road surface: bumps over a longer stretch.
• Recommended speed for safely traversing the road section A4 — Advisory speed: often as a plate at the hump.
• Start of a residential zone (woonerf) G5 — Home zone: humps are common there.