The cell phone is a marvelous
invention, but you should not use it while driving.
If you're looking at a keypad and punching in numbers
on a cell phone, vehicle navigation system, radio etc.,
it’s impossible to focus on what’s ahead
of you at the same time. Driving is a full time job.
It takes 100% of your concentration, and talking on
your cell phone while driving can take up a large percentage
of that concentration. Not being focused while driving
can easily lead to a collision.