Park Road in Peterborough city centre has been cordoned off by emergency services following a crash.
The East of England Ambulance Service Trust (EEAST), Magpas Air Ambulance and Cambridgeshire police are all on the scene.
A spokesman for EEAST said: “We were called at 12.03pm to a road traffic collision involving a single vehicle.
“One man is being treated at the scene.”
The road is closed to both vehicles and pedestrians, with police describing it as a ‘serious incident.’
There is no information about the man’s condition.