Maintenance vehicles carry a large yellow board on the back showing a flashing or fixed arrow. The arrow tells following drivers which side to pass on.
These vehicles may be stationary, crawling or performing rolling road blocks, so the board can appear with little warning.
What this sign means
The vehicle is working on the road and traffic must pass on the side the arrow points to. A downward chevron pattern means pass either side is not permitted and you should move over as directed.
The board may be mounted on a lorry, an impact protection vehicle or a trailer.
What to do when you see it
Move into the indicated lane in good time.
- Check mirrors and signal before changing lane.
- Pass only on the side the arrow shows.
- Do not sit close behind the vehicle waiting for a gap.
- Expect the vehicle to be travelling far slower than the traffic flow.
How this sign is tested
Questions show the arrow board and ask which side you should pass, which is simply the direction of the arrow.
Others ask why the vehicle carries a heavy rear structure, which is to absorb an impact and protect the crew.
Common mistakes
Ignoring the arrow direction and passing on the wrong side into the working area.
Braking hard on discovering the vehicle rather than reading the board at a distance.
Test yourself on this one
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Practise road sign questionsFrequently asked questions
Which side should I pass a works vehicle?
The side the arrow on its rear board is pointing to.
What is an impact protection vehicle?
A heavy vehicle with a crash cushion parked behind a works crew to absorb collisions.
Can these vehicles stop in a live lane?
Yes. They are permitted to work in a live lane with the arrow board displayed.