To look is to use sight to perceive an object.
To see is to notice or become aware of objects and surroundings using your eyes.
To perceive means to become aware of, to notice. Perception means coming to an opinion, interpreting a situation, based on on i the inputs of looking.
There is a great deal of practical difference between looking, seeing and perceiving. You can look and see something, but be unable to perceive what the thing is doing. In my opinion, based on learning and experience, I conclude that the driver did not perceive the situation due to the speed of the bike being something the driver could not perceive due to an inability to form an opinion based on lack of experience of that partcular situation.
When I was performing traffic law enforcement using radar, I would observe the approaching vehicle and, based on experience from watching vehicles approaching at speeds below the speed limit, would form an opinion as the whether the vehicle was travelling above the speed limit. Initially I never put a numerial value to that speed. The vehicle ws either 'up it', or not. Then I would release the beam of the radar and the instrument would calculate the speed and provide a numerical display. The number in the display window (if it was above the signposted speed limit) determined the penalty amount indicated on the infringement notice. I never could accurately determine the speed of a vehicle. The instrument did that for me. All I did was decide whether or not to take a shot with the beam.