Drivers are being urged to avoid the roads on Friday afternoon or face severe delays as the bank holiday getaway begins.
The RAC expects 12.5 million leisure journeys will be made by car between Friday and Monday for what is the last public holiday before Christmas. Friday is set to be the busiest day for getaway trips, with the worst tailbacks likely to be between 2pm and 7pm, according to the breakdown rescue company.
Two probable blackspots for queues identified by traffic information supplier Inrix are the M25 between Bromley and the Dartford Crossing, and the M60 between Junction 7 for the A56 (Altrincham) and Junction 18 for the M62. Motorists are advised to set off either before 7am or after 7pm to avoid traffic jams.