PEOPLE have been urged to "shop" drink drivers this Christmas.
Police in Calderdale are promoting two phone lines where people can leave information about people who booze and then get behind the wheel.
Their aim is to prevent tragedies from happening.
Sgt Garry Alderson, of Calderdale traffic police, said: "There are no two ways about it. Drinking and driving wrecks lives.
"That is why we are asking members of the public to help us to stop drink-drivers by telephoning our confidential information lines.
"This isn't about snitching on your friends. One call could help prevent a tragic accident."
Police need to know as much information as possible, including the name of the person, their vehicle registration number and when and where they normally drink and drive.
Calderdale Council's Road Safety Officer Peter Shepherdson said: "Alcohol affects everyone's judgement, but there are still people who think they are immune from its effects.
"They think they can drink and drive. We often see the results of their drink driving - crashed cars, seriously injured people and lives lost."
The numbers to call are 01422 318157, 01422 318146 or Crimestoppers on 0800 555 111.