It is known that your brain can filter out information it considers extraneous. If a driver is intent on watching for oncoming cars, his brain can fail to register a motorcycle which has a much smaller visual impact. So the the driver doesn't see the motorcycle right in front of him. It's a good idea to train your mind to always look for cars and motorcycles and bicycles when you make a left turn.
I’m gonna assume he was playing with his phone
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