Police were advising motorists to avoid the A10 junction with A110 (Southbury Road) area whilst a collision between a police van and a pedestrian was investigated.
Shortly before 16:00hrs on Wednesday, 25 June the marked police van was travelling eastbound on Southbury Road, Enfield when it was in collision with a female pedestrian.
The pedestrian, a woman her 20s, was taken to hospital by London Ambulance Service where she remains in a stable condition.
The driver and passenger of the police van, both male PCs, were uninjured and stopped at the scene.
Traffic officers were at the scene and enquiries into the circumstances are ongoing.
The Directorate of Professional Standards has been informed as is routine.