Subsidence, thought to have been caused by torrential rain, led to a village road closure.
The road, Shepherds Way, in Brookmans Park, cracked and buckled after last week’s deluge and was closed by county council highways contractor Ringway.
The roadblock made getting to Queenswood School difficult.
The school’s transport manager John Luck, who blamed the weather for the subsidence, said: “The entrance to the A1000 (Great North Road) to Shepherds Way is closed.
“You get diverted and the other entrance is also closed.”
Matthew Kelley, Ringway divisional manager, said: “Ringway attended a report of a fallen tree on Shepherds Way, Brookmans Park.
“Whilst the tree was being cleared, an area of subsidence in the carriageway was noticed.
“Subsequently, a decision was made by Hertfordshire Police to close the road until an investigation into the subsidence could be completed.”
He added: “Ringway is monitoring the situation on site and will carry out a detailed inspection of the carriageway to determine what action needs to be taken to ensure the safety of road users.”
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