A motorcyclist is being treated by paramedics at the scene of a two-vehicle crash in Tolleshunt Major.
Witham Road is closed in both directions after ambulances were called at 1.50pm.
The one patient, a man described as being in his 30s or 40s, is suffering from abdominal injuries and a spinal fracture.
An East of England Ambulance spokesman said: "His injuries are not thought to be life-threatening at this stage."
She added that he is fully conscious and able to chat to ambulance crews.
A helicopter is at the scene to airlift him to hospital.
