The festival will be taking place until Sunday.
Festival-goers are being urged to think twice before driving home from Electric Picnic after drinking the night before.
Drinkaware says almost a quarter of adults don't recognise the dangers of next-day drink-driving, rising to more than a third of those under 35.
CEO Dearbhla O'Brien says feeling fine the following morning doesn't necessarily mean someone is safe to drive:
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