15 July 2013, 12:39 | Updated: 15 July 2013, 12:47
An investigation's been started after part of the M25 in Hertfordshire buckled on one of the hottest days of the year so far.
The Highways Agency closed a section of the motorway near Junction 23 for Potters Bar for more than 12 hours on Sunday 14 July 2013 after the road became uneven.
The closure led some drivers being stuck in their cars for four hours as temperatures across the UK got up to 32C.
Emergency repairs were carried out overnight and the clockwise carriageway was reopened at 5.30am on Monday 15 July.
The Highways Agency say their top priority was been to re-open the M25 to traffic as soon as possible.
They say "it was regrettable that drivers were stuck in traffic on such a hot Sunday afternoon but the precaution was taken to close the carriageway after a defect across three lanes led to safety concerns."
It's not yet known if the problem with the motorway was caused by the extreme temperatures.