W321
At a glance
- Sign code
- W321
- Type
- Warning
- Official meaning
- Warning of a length restriction ahead at the value indicated.
What the Length restricted sign means
Warns that a length restriction is coming up, at the length shown on the sign.
What you must do
If your vehicle and any trailer are longer than the length shown, do not proceed; choose an alternative route suitable for long vehicles.
Know the mistake this sign turns on
Full access adds the confusion Length restricted is most often mistaken for and the hint for the test, on this sign and every other one — plus practice questions and timed mock papers. The practice sample and the readiness test are free.
See the free practice testSources
- Road Traffic Signs chart, National Department of TransportThe official chart. Sign W321 was checked against it, artwork and meaning, before being published here.
- National Road Traffic Regulations, 2000 — Schedule 1Where the prescribed meaning of each road traffic sign is set out.
Last updated 2026-08-23.