Some parts of the country saw roads softening as temperatures shot up.
Gritters have been deployed in some areas to spread crushed rock dust to create a non-stick layer between the surface and vehicles’ tyres, with the AA warning that roads begin to soften at around 27C.
Cumbria County Council said: “Our gritters are on call. Roads are 20C hotter than the air and melt at 50C.”
The Communication Workers Union shared pictures of roads damaged by the heat, with one taken by a post office worker on Exmoor showing a stretch of melted road with tyre impressions in the softened surface road at Heasley Mill, near North Molton, Devon.
Drivers have been advised to use warm soapy water to clean sticky tar from their vehicles.
At the same time daytrippers clogged coastal routes as they headed for the seaside, including the A23 to Brighton, A31 to Dorset, A30 to Cornwall and M55 to Blackpool.
More than 30,000 UK breakdowns were expected on Saturday, with call-outs set to have doubled in tourist areas according to the RAC.
More than 150,000 visitors were expected in Brighton, 75,000 in Bournemouth, 75,000 in Great Yarmouth and 50,000 in Blackpool.