Holidaymakers have been told to allow an extra 90 minutes for their journeys this weekend as they join the busiest summer getaway for five years.Record numbers of motorists plan to hit the road, choosing to take advantage of the good weather forecast for next week and enjoy a staycation rather than travelling abroad.Around five million leisure trips are planned for Saturday followed by a further 3.4million tomorrow, according to the RAC, with travel times expected to increase throughout the weekend.Data from Inrix, the transportation analytics specialists, suggests that the M1 southbound from junctions 16 to six and the M25 anticlockwise from junctions four to one will be the worst affected, with jams of 90 minutes and 60 minutes respectively.Significant queues are also likely on the M40, M5, M20 and M6. Motorists are advised to travel after 8pm if possible to avoid the worst of the traffic.Temperatures are expected to soar across southern England next week, reaching highs of 33C on Tuesday. Motorists are being warned to expect severe congestion on major routes this weekendCredit:Gareth Fuller/PA Met Office forecasters said that after a wet and windy start to the weekend, Sunday would be generally dry with sunny spells and temperatures in the mid-20s.George Flinton from York, the AA’s Patrol of the Year, warned holiday makers that “preparation is key” and urged motorists to take time to check their vehicles, plan journeys and pack essentials before setting off. He said: “Motorways, coastal routes and roads to ferry crossings, airports and the Channel Tunnel are likely to be busy. If you can, set off early to beat the queues or wait until later to miss the daytime heat.”Some 13.4 million leisure trips were expected to take place by car between Friday, as the school holidays began, and on Sunday , according to a survey by the RAC and Inrix.This is around four million more than the same weekend last year and represents the biggest summer getaway since 2014.Experts said it was likely due to the good weather while many were dissuaded from booking foreign holidays due to the uncertainty caused by Brexit.Rail journeys will also be disrupted as a 16-day closure of a major junction on the West Coast Main Line begins today (SAT).Network Rail is carrying out major upgrades of track, signalling and overhead lines at Acton Grange junction, between Crewe and Preston. The work will mean delays between London Euston and Scotland, with rail replacement buses in use for some sections.Rail services will also be disrupted as the first of three strikes by senior conductors on East Midlands Trains begins today (SAT). Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. Members of the Rail, Maritime and Transport (RMT) union will walk out for 24 hours, followed by further stoppages on July 27 and August 3 in a dispute over pay and contract issues.Abta, the travel trade association, said Spain remained the number one destination with strong demand for Bulgaria, Croatia, Turkey and Morocco.Families looking for a last-minute deal are advised to head to the Greek islands, the Canaries and Italy’s Amalfi coast.Mark Tanzer, Abta’s chief executive, said: “Thousands of families will be jetting off this weekend as the majority of schools in the UK start their summer break.”The roads in the UK will be very busy and families should leave extra time to get to their departure ports and, if using public transport, check in advance for any engineering work.”Thomas Cook Airlines has 244 outbound flights to 47 destinations this weekend, with more than 54,000 holidaymakers taking to the skies.