Music-lovers flocking to the V Festival this weekend have been urged to stick to designated roads.
Police have set up signs and diversions to help 90,000 people attend the event at Weston Park, at Weston-under-Lizard on the Staffordshire/Shropshire border.
Event officers have warned that congestion is "inevitable", with 35,000 extra cars expected.
Drivers from the west have been told to leave the M54 at junction 3 and follow signs along the A41 to the West Gate car park. From the east, drivers should leave the M6 at junction 12 and follow signs on the A5 to the East Gate.
Arriva buses will ferry people from both Wolverhampton and Stafford rail stations to Weston Park and back again for a return fare. To avoid congestion they will use a separate entrance to the festival site.
Event commander Chief Inspector Peter Taylor said: "With up to 35,000 cars expected, some congestion is inevitable. Signs advising motorists to avoid the area around Weston Park during the event are already up.
"Those not attending the festival should seek alternative routes, and particularly consider using the motorways instead of the A5."
The village of Tong and some local roads will be closed to festival traffic but will be staffed by stewards to ensure residents and emergency services have full access.
A tow-away zone will be clearly signposted and enforced during the event. Vehicles left in the zone will be removed at the owners' expense, as will any vehicles left on site after 12pm on Monday, August 21.
Festival-goers are urged to contact the police if they know of anyone or any vehicles they believe to be involved in criminal activity, by using a special text messaging service - text vfest (then message) and send to 60066, or email vintelligencestaffordshire.pnn.police.uk, or phone Crimestoppers anonymously on 0800 555 111.