There is store surveillance video from another angle that shows the driver of the car he hit had the green turn arrow at the time.
I did a rough calculation and he was doing approx. 175 ft. per second and in just two seconds time (not even time for the car to complete the left turn) the guy traveled over a hundred yards, the length of a football field.
So when they started the turn on the green, there was nothing there then bam!