Via David Pescovitz, I came across this remarkable video of a collision at an intersection when a ‘ghost’ car appears out of nowhere right into the path of another car.
Of course, spooky background music notwithstanding, there is no ‘ghost’ car. I think what happened is that the video starts just after the view of the small car was blocked by the larger car and that both cars just happened to move in such a way that the small car remained hidden until the collision.
What is difficult to explain is why the driver of the bigger car did not see the smaller car in its path. The driver may have been distracted or, because they were turning right, may have been looking right and missed the car coming from the left, a common error.