Drivers are being warned they could face severe queues next week with more than 25 million leisure car journeys expected on UK roads.
Good Friday will be the busiest day with 4.4 million journeys causing major routes to be clogged between 11am and 4.30pm, RAC research suggests.
RAC spokesman Rod Dennis said: "This week we're expecting a significant second wave of Easter getaway traffic, following that which we saw at the start of April when schools broke up.
"This will mean the coming week and the bank holiday will likely be characterised by lengthy queues in some spots.
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"Traffic jams are frustrating at the best of times and while we can predict where some of these will crop up, it only takes a single bump or breakdown for huge tailbacks to form."
Mr Dennis urged motorists to carry out essential maintenance checks before embarking on journeys, such as tyre pressure and oil level.
Dan Croft, incident group operations manager at traffic data firm Inrix, said: "During peak hours over Easter, journeys could take UK drivers three times longer than usual.
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"We are predicting Good Friday will be the worst for traffic from late morning into the afternoon.
"For drivers looking to avoid the worst congestion, the best options are to travel on Saturday, set off early in the morning and keep updated with real-time traffic data."
Rail passengers also face disruption over the bank holiday weekend as Network Rail carries out engineering work, with an amended service between Preston and Glasgow Central.
