What must you do when you hitch an unbraked trailer to a towing vehicle?
- A Fit a secondary coupling device
- B Grease the tow ball and hitch
- C Switch off the car's reversing sensor
- D Fit a breakaway cable
Why this is the answer
If a tow hitch fails, the trailer must stay connected to the towing vehicle. This is achieved by using a secondary coupling device, such as a safety chain.
Why the other answers don't fit
- B
- Grease the tow ball and hitch — Grease helps the hitch work smoothly and secures nothing.
- C
- Switch off the car's reversing sensor — A reversing sensor is a convenience with no bearing on the coupling.
- D
- Fit a breakaway cable — A breakaway cable applies the trailer's brakes, and an unbraked trailer has none.
Where this comes from
- Driving: the essential skills — section 19
- The Highway Code — rule 98
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: Driving Instructor (ADI Part 1)
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