I couldnt get the picture of the ambulance. I'm attaching a sketch of the scene. Actually in real the curve at which the accident happened, cars usually come around 80km/hr and its hard to see who is comming from the other side (due to that road curve). So the prado guy may have not expected a car comming from the other side.
Original Traffic Flow
Traffic Restricted to one way due to Maintainance
But the bottom line is that, one shouldnt take sharp turns at high speeds. You cant predict whats waiting for you there. In normal or other times, we should always respect emergency teams (ambulance, fire etc) and give them a way so that they reach in time.