Severe traffic congestion and rail closures will hamper this weekend's bank holiday getaway.
An RAC survey suggests 22 million leisure trips have been planned between Friday and Monday, leading to extensive jams".
Getaways are expected to peak on Saturday with 6.6 million trips, according to the RAC survey of 1,709 UK drivers.
Major roads are likely to be busiest between 10am and 3pm that day, suggesting motorists should set off as early as possible to avoid congestion.
Routes leading to the coasts and national parks could see the worst traffic.
Rail passengers also face disruption over the coming days as Network Rail carries out various engineering projects.
Significant work on the West Coast Main Line will see changes to services between London Euston and Cumbria throughout the weekend.