Designated drivers have been warned to learn their responsibilities and stay out of legal trouble during the festive period.
For example, drivers are punished if passengers under 14 do not wear their seatbelt, regardless of who owns the car.
Yet the Institute of Advanced Motorists (IAM) wants owners to know even if they give their keys to a friend because they are over the limit, they are still responsible for their vehicle's roadworthiness.
Peter Rodger, IAM chief examiner, said: "We're coming up to the season of designated driving, and car owners should make sure they understand their responsibilities before handing over their keys.
"As a car owner, it's your responsibility to ensure your car is roadworthy, correctly taxed and insured. You will also be the one to bear the brunt of certain parking offences.
"You also need to make sure the person borrowing has a valid driving licence, is insured and is not under the influence of drink or drugs."
The IAM is an independent road safety charity, dedicated to raising driving standards, engaging with the road-using public and influencing road safety policy.
It runs an advanced driving test and an advanced driving course, available to car, motorcycle and commercial licence holders.
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