What warning does the driver of a petrol tanker have that 'rear wheel lift' is about to become 'roll-over'?
- A The steering becomes heavy
- B The driver has very little warning
- C The air pressure drops
- D The diff-lock engages
Why this is the answer
The transition from 'rear wheel lift' to 'roll-over' is more rapid on vehicles equipped with air suspension systems. Make sure you take advantage of any extra training that may be available to drivers of this type of vehicle.
Why the other answers don't fit
- A
- The steering becomes heavy — The steering gives no warning; the lift happens at the trailer, behind you.
- C
- The air pressure drops — Air pressure is unaffected by a wheel leaving the ground.
- D
- The diff-lock engages — The diff-lock is engaged by a switch, not by the vehicle itself.
Where this comes from
- Driving Goods Vehicles — section 7
Rule numbers link to The Highway Code on gov.uk.
Where this question comes from
The question, its options and the explanation are reproduced word for word from the DVSA revision question bank under licence. The licence requires them to appear unaltered, so we cannot reword them and neither can anyone else — that is why you will meet the same wording on other sites. Everything else on this page is written by Theory Hub: the explanation of why each wrong answer is wrong, the topic guide and the revision notes.
Asked in: Lorry & Bus (LGV/PCV)
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