A spokesperson for National Highways, which operates and maintains major roads in England, said while they could not comment on the specifics of the events, they were sorry to hear about the injuries.
They said National Highways had a target of repairing the most serious defects within 24 hours of them being reported.
“Safety is our primary concern, and we set stringent standards for pothole repairs on our roads.”
The organisation is responsible for about 4,500 miles of motorways and major A roads, carrying about a third of all traffic and about two-thirds of freight.
In a separate statement, it said: “For the past four years we have consistently met the national target, ensuring that over 90 per cent of our motorways and major A-roads remain in good condition.”
The Department for Transport target for the amount of the national road network to be “maintained to a good condition” is 96 per cent.