Extreme temperatures are melting roads leading to emergency repairs, say council highways officials.
Vale of Glamorgan council gritting vehicles, normally used in winter, are laying crushed rock dust to protect road surfaces reaching 49C (120F).
Similar problems have been reported in Pembrokeshire, Carmarthenshire, and Gwynedd.
Highways officials said UK roads were laid with bitumen graded for colder weather.
Ken Evans, acting routine maintenance manager at the Vale of Glamorgan council, said highways staff recorded road temperatures of 49C (120F) on Wednesday at 15:00 BST. The council is now using gritting lorries to prevent roads from being damaged by the heat.
Meanwhile, Pembrokeshire council is carrying out emergency repairs to one of the main roads in Tenby which has also been affected by the weather.
“There is no doubt that the recent spell of extremely hot weather is responsible for the deterioration of the surface,” said councillor Rob Lewis, council cabinet member for highways and planning.
Carmarthenshire council executive board member Colin Evans said: “It is important that drivers are made aware that the high temperatures have caused minor damage to some of the roads and that they should take notice of any signs and drive accordingly.
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