The AA predicts about 12 million cars will be on the roads due to a combination of people visiting loved ones, shopping trips and holidays, as well as those travelling to and from work.
It commissioned a poll of more than 19,000 motorists which found that 41 per cent expect to drive more than 20 miles on Friday.
AA patrol of the year John Snowling said: ‘On Friday, it’s likely to be very busy at peak times on the major routes as the Christmas getaway coincides with commuter traffic.
‘With Christmas falling on a weekend, many people will start their break from Friday, but almost a third of our members will be making their journey on Saturday and more than a fifth will be travelling on Christmas Day to visit friends and family.’
It’s despite an earlier report by traffic information supplier Inrix which predicted that 4pm on Friday December 16 would be the busiest time on the roads during the festive period.
Some 448 miles of roadworks on England’s motorways and major roads have been suspended or completed in a bid to reduce disruption.
Highways England said this would leave 98 per cent of its network free of roadworks until January 3.
Roadside rescue firm Green Flag estimated almost 500,000 people will break down between December 15 and January 15 – equivalent to one every 11 minutes.
The most common causes are expected to be battery faults, with more than 95,000 cases, followed by around 36,000 punctures and 22,000 engine failures.
Green Flag’s head of rescue Neil Wilson said: ‘Many people will be hitting the roads to visit family and friends, and with adverse weather conditions it’s important to ensure you have carried out the relevant car safety checks in order to avoid car faults and breakdowns.’
Amid the alterations to rail services, coach operator National Express reported last month that its bookings for Christmas Day were up by more than a third compared with the same point last year while demand for seats on Boxing Day has risen by 19 per cent.
The firm is running its biggest-ever Christmas service, with 50 per cent more coaches on the roads on December 25 this year than in 2015.
Travel association Abta said Friday is expected to be the busiest day for airports as people jet off to spend Christmas overseas.
More than 4.5 million people will head abroad from the UK between December 18 and January 2.
Heathrow said the most popular day for flights in the week leading up to Christmas will be Friday, with more than 118,000 departing passengers.