Warning sign · W321
Length restriction ahead sign (W321)
A vehicle-length restriction applies ahead.
What does the length restriction ahead sign mean?
A vehicle-length restriction applies ahead.
What should you do?
Check that your vehicle combination meets the restriction.
| Sign code | W321 |
|---|---|
| Sign group | Warning signs |
| Applies to | All learner codes (1, 2 and 3) |
| Test section | Road signs and markings |
How to recognise the length restriction ahead sign
A triangle with a length figure beside a vehicle.
Where you will see it
Ahead of a stretch where bends or structures prevent long vehicles passing.
What to do when you see it, step by step
- If your vehicle or combination is longer than the figure, find another route.
The common mistake
The length warning matches R205. The warning is not the restriction itself.
Why this sign matters
Sharp bends and structures can make a road impossible for long vehicles. The warning gives drivers time to turn off before they are trapped.
About warning signs
Warning signs tell you about a hazard ahead so you can slow down and prepare. They are red-bordered triangles. The K53 learner's test asks you to recognise signs like the length restriction ahead sign (W321) and choose the correct response, so learn both the picture and the action.
How to answer a test question about this sign
- Look at the shape and colour first. They tell you the group: warning signs for this one.
- Recall what the sign asks of you: check that your vehicle combination meets the restriction.
- Remove the options that describe a different group of sign, then choose the response that matches the action.
Want the full explanation? Read the chapter Warning signs and temporary road controls.
Signs it is often confused with
Learners mix up signs that look or sound similar. Compare the length restriction ahead sign with these:
Height restriction ahead (W320)A triangle with a height figure above a structure.
Crossroad ahead (W101)A triangle with a plain cross showing a road crossing yours.
T-junction ahead (W104)A triangle showing your road ending against a road that runs across it.Test yourself: Length restriction ahead sign questions
1 What does this sign mean?
- Vehicles higher than the displayed limit may not proceed.
- A vehicle-length restriction applies ahead.
- The road surface is uneven ahead.
Show the answer
Answer B: A vehicle-length restriction applies ahead.
Check that your vehicle combination meets the restriction.
Memory tip: W321 · Length restriction ahead
All vehicle codes
2 Which response fits this sign?
- Check the height of the whole vehicle and load.
- Check that your vehicle combination meets the restriction.
- Slow down and maintain smooth control of your vehicle.
Show the answer
Answer B: Check that your vehicle combination meets the restriction.
Length restriction ahead: A vehicle-length restriction applies ahead.
Memory tip: Check that your vehicle combination meets the restriction.
All vehicle codes
Length restriction ahead sign: quick questions
What does the length restriction ahead sign (W321) mean?
A vehicle-length restriction applies ahead.
What should you do at the length restriction ahead sign?
If your vehicle or combination is longer than the figure, find another route.
Where will you see the length restriction ahead sign?
Ahead of a stretch where bends or structures prevent long vehicles passing.
What is the common mistake with the length restriction ahead sign?
The length warning matches R205. The warning is not the restriction itself.
Sign artwork: Southern African Development Community (SADC), public domain. AceK53 is an independent study aid. Always confirm test requirements with your driving licence testing centre.