gpsman writes:

Wrong, and nonsensical.

They see cars and obstacles, but not motorcycles and pedestrians. That's not
because of any fatigue in the retina or elsewhere in the vision system.

http://en.wikipedia.org/wiki/Inattentional_blindness
http://en.wikipedia.org/wiki/Attention
http://en.wikipedia.org/wiki/Attentional_Blink
http://en.wikipedia.org/wiki/Attentional_shift
http://en.wikipedia.org/wiki/Change_blindness
http://en.wikipedia.org/wiki/Visual_perception

Ah yes, Wikipedia ... the final authority when it supports you, and amateur
nonsense when it doesn't.