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Besides the tow ball, what extra safety device must connect a trailer to your car?

A spare tyre
A tow rope only
A warning triangle
A breakaway cable or secondary coupling
Correct

Why?

Rule 98 of The Highway Code says a trailer must have a secondary coupling. A breakaway cable or secondary coupling keeps the trailer attached, and applies its brakes, if it ever comes off the tow ball, stopping it running away.

Highway Code rule 98

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Besides the tow ball, what extra safety device must connect a trailer to your car?

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