Driving theory questions

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Which option is true for winter road conditions?

  • Correct: If the car has studded tyres, a connected trailer (all types) must have studded tyres. This is to avoid the jack-knife effect.
  • Incorrect: If the car has studded tyres, a connected braked trailer must have studded tyres. Unbraked trailers do not require studded tyres since they cannot brake anyway.
  • Incorrect: If the car has studded tyres, a connected light trailer does not require studded tyres. This is because light trailers are rarely used for long distances.

If the towcar has studded tyres, the trailer must also have studded tyres during winter road conditions.” (Swedish Transport Agency)

The jack-knife effect entails the car braking better than the trailer, which leads to the trailer exerting force from behind and potentially sliding out to the left or right. This makes the car and trailer fold together like a jack-knife.


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