W327
At a glance
- Sign code
- W327
- Type
- Warning
- Official meaning
- Warning of a structure on the road ahead that allows passage of only a single vehicle width.
What the Single vehicle width passage ahead sign means
Warns that there is a structure ahead (such as a narrow bridge or underpass) wide enough for only one vehicle at a time.
What you must do
Slow down, check for oncoming traffic, and give way or wait so that only one vehicle passes through the structure at a time.
Know the mistake this sign turns on
Full access adds the confusion Single vehicle width passage 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 W327 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.