i really think you're jumping to an unsupportable conclusion here.
Everyday when you drive, do you:
Stop at stop signs
Catch when a light is turning
pay attention to whos pulling out/in
Pay attention to those in front, whose riding your bumper, and whos trying to pass
read road signs
You're paying attention to multiple things at once,
its the same thing thing as:
glancing at dark alleys ( avoudung them if you can)
Paying attention to whos around you and where they are
The former is actually more to keep track of then the latter.
Its the same process of being aware of what happening around you