Heavy traffic is expected on the M7/M8 near Portlaoise this morning as tens of thousands of festival-goers return home from Electric Picnic.
The three-day event finished up last night and all the campsites officially close at lunchtime.
Those leaving the festival are being reminded that it takes about one hour for the body to process each small glass of beer.
Fionnuala Sheehan from drinkaware.ie has said this means people drinking last night should think twice before getting behind the wheel this morning.
"If you get into a car where the driver has been drinking you are taking a risk," she said.