They are reminding people they are always at risk of losing their licence if caught breaking the rules of the road.
The Road Safety Authority is encouraging young people not to lose their licence this weekend after Electric Picnic.
Its new campaign is highlighting good driving habits - as well as the dangers of driving 'the morning after'.
The initiative - which warns you could lose your independence if you lose your licence - has come in for criticism from TD Ciarán Cannon, who says there's more to life than driving.
Sarah O'Connor from the RSA outlines some of the features of on-site breathalysers at EP:
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