A road worker is in a critical condition after being badly injured while working on the A14 roadworks near Kettering.
Police were called to the incident between Junctions 7 and 8 on the eastbound carriageway at about 1.25pm on Sunday.
A police spokesman said: “We were called at 1.25pm to a report of a road traffic collision involving a road worker and truck, between Junctions 7 and 8 on the eastbound side of the carriageway.
“The man was taken to Kettering General Hospital but has been transferred to University Hospital Coventry with serious injuries.
“He is in a critical but stable condition.”
The spokesman added that they are working with Health and Safety Executive as the collision took place within the roadworks rather than on a public highway.
A Health and Safety Executive spokesman said: “We are aware of this and are working with the police.”
A spokesman for the Warwickshire & Northamptonshire Air Ambulance said: “A crew was dispatched to help provide rapid emergency medical care for a 25-year-old male road worker who’d been run over by a dumper truck.
“The patient had sustained a large haemorrhage to his groin, as well as suspected leg and pelvic fractures.
“After arriving at the scene, the on-board WNAA doctor and critical care paramedic worked with East Midlands Ambulance Service to swiftly control his bleeding, before applying a pelvic splint and a traction splint to support his leg injury.
“The patient was also given medication to prevent further blood loss, and a quick decision was made to transfer him a very short distance by land ambulance to Kettering General Hospital.
“Here he received several units of blood, replacing some of the blood lost after the incident occurred. He was also given antibiotics and pain relief to help ease his discomfort.
“WNAA flew to meet the medical team at a landing site near to the hospital, and after 30 minutes the patient’s condition had improved enough for him to be flown to the Major Trauma Centre at University Hospitals Coventry and Warwickshire to continue urgent care.”