North Wales Police has launched its campaign to tackle the increased amount of drink-drivers at Christmas time.
Thousands of motorists face being stopped over the next few weeks as teams from all four Welsh forces conduct roadside checks across the country.
During Christmas last year, 500 people in Wales were caught driving over the legal limit and over 35,400 breath tests were carried out.
The North Wales campaign is being supported by the family of Kieran Lea Arnold, from Cymau, near Wrexham, who was killed by a drunk driver in June this year.
Kieran's family have spoken of the pain of losing their 'popular, gentle giant' to a drunk driver, and have helped put together a short film on the effects of getting behind the wheel when over the limit.
More top news
Aaron Ramsey says Wales can exploit England's weaknesses when the two countries meet at Euro 2016.
David Cameron could call for extension of EU tariffs.
New laws come into force today to help police tackle the sale and production psychoactive substances.