It takes micro-seconds to turn your head enough to see what's around you. If you run into someone in front of you because you glanced around you were FOLLOWING WAY TO CLOSE.
And the reason there are rear end accidents.
Merging into tightly spaced interstate traffic, following another car in front takes a lot for granted the person front will not panic at last moment and hit their brakes at the end of the merge lane without any warning.
.
(60 mph = 66/ft/second, or about the time one takes to a "quick"(?) glance over one's shoulder and judge speed, distance, dynamic positions, and intentions of other cars maybe even looking over their shoulder?
)
QED
