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27 May 2016, 06:23 | Updated: 27 May 2016, 06:25
The AA in Basingstoke expected traffic over the weekend to be almost 50% higher than normal.
The M25 between junctions nine and 21 and the M5 southbound from junction 14 to 22 are expected to have the worst congestion, with delays of up to 90 minutes.
AA president Edmund King said: ``Spring bank holiday and the start of the summer half term are on a collision course on Friday and drivers will have to expect delays.
``With temperatures picking up, travellers will have to make sure their cars don't overheat and also carry water for themselves should they get stuck in a traffic jam.
``Delaying departure until later in the evening is often a shrewd move as the combination of work exit and holiday exodus traffic tends to ease after the rush-hour.''
Some Great Western Railway trains will be diverted or suspended due to an upgrade of signalling equipment and electrification work in Bristol.
NR chief executive Mark Carne said: ``Our work to build a bigger, better railway takes place round-the-clock, each and every day of the year.
``We've been careful to plan our work this bank holiday weekend to keep disruption to a minimum and it is good news for passengers that the majority of journeys will be unaffected.
``More than 9,000 men and women will be working hard this bank holiday weekend to improve the network as part of our Railway Upgrade Plan which will provide better, more reliable journeys for passengers and businesses across Britain.''