W355
At a glance
- Sign code
- W355
- Type
- Warning
- Official meaning
- Warning sign indicating a section of road where traffic congestion may be encountered.
What the Traffic congestion ahead sign means
Warns that traffic congestion or queues are likely on the road ahead.
What you must do
Reduce speed, increase your following distance and be ready to stop, as traffic ahead may be slowing or stationary.
Know the mistake this sign turns on
Full access adds the confusion Traffic congestion ahead 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 W355 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.