Warning sign · W324
Slow heavy vehicles sign (W324)
Slow-moving heavy vehicles may be ahead.
What does the slow heavy vehicles sign mean?
Slow-moving heavy vehicles may be ahead.
What should you do?
Adjust speed early and keep a safe following gap.
| Sign code | W324 |
|---|---|
| Sign group | Warning signs |
| Applies to | All learner codes (1, 2 and 3) |
| Test section | Road signs and markings |
How to recognise the slow heavy vehicles sign
A triangle showing a heavy vehicle on a slope.
Where you will see it
In mountain areas where heavy vehicles descend slowly.
What to do when you see it, step by step
- Slow down, and be able to stop within the distance you can see, especially on bends.
The common mistake
Heavy vehicles take longer to stop on a descent, so give them space.
Why this sign matters
Heavy vehicles move slowly downhill and need a long distance to stop. The warning helps you keep a safe gap and plan your move.
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 slow heavy vehicles sign (W324) 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: adjust speed early and keep a safe following gap.
- 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 slow heavy vehicles sign with these:
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.
Skewed T-junction (W105)A triangle showing a T-junction whose cross-road meets yours at an angle (one of a left/right pair).Test yourself: Slow heavy vehicles sign questions
1 What does this sign mean?
- Hitch-hiking is prohibited on this road section.
- Slow-moving heavy vehicles may be ahead.
- Falling rocks may obstruct the road ahead.
Show the answer
Answer B: Slow-moving heavy vehicles may be ahead.
Adjust speed early and keep a safe following gap.
Memory tip: W324 · Slow heavy vehicles
All vehicle codes
2 Which response fits this sign?
- Look for debris and reduce speed to leave room to react.
- Do not seek a lift by hitch-hiking here.
- Adjust speed early and keep a safe following gap.
Show the answer
Answer C: Adjust speed early and keep a safe following gap.
Slow heavy vehicles: Slow-moving heavy vehicles may be ahead.
Memory tip: Adjust speed early and keep a safe following gap.
All vehicle codes
Slow heavy vehicles sign: quick questions
What does the slow heavy vehicles sign (W324) mean?
Slow-moving heavy vehicles may be ahead.
What should you do at the slow heavy vehicles sign?
Slow down, and be able to stop within the distance you can see, especially on bends.
Where will you see the slow heavy vehicles sign?
In mountain areas where heavy vehicles descend slowly.
What is the common mistake with the slow heavy vehicles sign?
Heavy vehicles take longer to stop on a descent, so give them space.
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.