A pop from the left is when a car attempts to turn from a multi-lane road, crossing multiple lanes, and is hit by a car coming from one of the far lanes while turning in.
-a: The red car turns across multiple lanes through the opening the blue car left him, but does not see the green car. The green car hits the red car.
-f: The red car is more cautious, and turns across lanes slowly. He comes to a stop before the green car can hit him.
-d: The green car notices the blue car has left a gap for other cars to turn through. The green car slows down to watch for any cars coming across lanes, and notices the red car coming. The green car slows to a stop, preventing the accident.
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