Part of the A140 in mid Suffolk has been closed as hot weather has made the road unsafe.
Police are urging drivers to avoid the A140 between The Magpie pub in Little Stonham and the junction for Mickfield.
In a tweet, Suffolk police said the closure has been put in place as the surface is causing problems for drivers and is unsafe due to the hot weather.
According to the Met Office, the temperature in Mickfield was 23C at the time of the closure being announced.
Traffic is building up on either side of the closure, according to the AA traffic map.
It is not yet known how long the road will be closed for.
A Suffolk Highways spokesman said: "Some issues have been identified with the road surface along the A140 which have been made worse by the hot weather.
"Our teams are working to maintain traffic flow, by applying grit to the road and placing ‘20mph’ and ‘uneven road surface’ signs to warn road users.
Additional works will take place next week to repair any damaged areas of road surface. We apologise for any inconvenience this may be causing."
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