Ashburton police conducting an intersection campaign were at the wrong place at the wrong time when a vehicle collided with an ambulance near the hospital this morning.
Police and an ambulance were called to attend the accident on the intersection of Walker and Wills Streets at about 9am.
Constable Paula Williams said the male driver, the sole occupant of a Mitsubishi Espada, allegedly failed to give way while heading west on Wills Street, colliding with the ambulance and causing it to tip on its side.
No-one was injured in the collision and the ambulance was not carrying passengers at the time.
Ms Williams was parked on the intersection of Moore and Cass streets monitoring drivers at the well-known black spot when she was called to the accident.