Sign C18: Closed to vehicles wider than indicated on the sign.

Legal meaning

Closed to vehicles which, including their load, are wider than indicated on the sign.

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

Shape and colour

Round white sign with a red rim, two black triangles sideways and a measure in metres: closed to vehicles wider than that.

Where the sign stands

At the start of the narrow stretch, right after the junction or just before the narrowing, on the right.

What the exam asks about this sign

The question gives a vehicle width and a sign with a measure: if the vehicle including load is wider, the road is closed. Mirrors generally do not count, load does. Trap: candidates confuse the sideways arrows (width) with the arrows above and below (height, C19).

Exam question on this sign

Often confused with

• Closed to vehicles higher than indicated on the sign. C19 — Arrows above and below: height.
• Closed to vehicles and combinations of vehicles which C17 — A length in metres beside the vehicle.
• Clearance height of an underpass, as indicated L1 — Blue sign with a height: information about an underpass, no ban.