Fleet experts say the move should prompt companies who do not have drink-drive policies in place to introduce them now.
The government and police have joined forces for the annual THINK! drink-driving campaign, now in its 30th year.
Transport secretary Douglas Alexander said: ‘What the THINK! campaign is saying to drivers is very simple – enjoy the Christmas season, but remember drinking and driving do not mix.
‘With prison sentences up to six months for those caught over the limit, drink-driving is an unnecessary gamble to take.’
This year’s campaign has a particular focus on young drivers but anyone involved in a crash in England or Wales during December will be breathalysed.
Road safety organisations say the campaign gives fleets a timely reminder to ensure they have communicated their drink and drugs policies to drivers. Roger Vincent, spokesman for the Royal Society for the Prevention of Accidents (RoSPA) said: ‘This campaign is a reminder to companies about their responsibilities to their drivers.
‘If they have been turning a blind eye in the past to drink-drive policies, then now is the time to rectify that and ensure they have a specific policy as part of their occupational road risk policy.’ The campaign comes as research by Churchill Insurance suggests four million motorists will drink and drive over the festive season.