Download is one of the UK's biggest music events
Holidaymakers and music fans have been warned to allow extra time for their journeys during the Download festival.
About 70,000 are expected to attend the music event which runs from Friday to Sunday and camp sites are already open.
The Donington Park venue is next to East Midlands Airport and those flying in and out have been told to expect heavy traffic throughout the weekend.
Diversions will be in place on Monday to deal with people leaving the festival site.
Kelly McHugh, transport manager for East Midlands Airport, said: "We always recommend that our customers check in at least two hours before their flight is due to depart.
"With the extra cars on the road this weekend, we are advising people to allow even more time in planning their journey to and from the airport.
"We don't want people to miss their flight or aircraft to be delayed, so the more prepared you can be the better."
Leicestershire Police echoed the call for everyone to expect heavy traffic, and also asked those camping at the site to be careful of their valuables and behave in a responsible manner.
Insp Chris Brown said: "This year we are urging everyone to think carefully about what they bring to the festival and how they are going to keep their belongings safe when they are there."