You Rest Your Foot on the Brake Pedal.

"Just resting your foot on the brake pedal will cause very light pressure on the brake pads thereby causing premature pad and rotor failure and having a negative effect on gas mileage. I have replaced rotors and pads with less than 5,000 miles on them when they should have lasted for 80,000 miles or more."  (Thanks to Frederick Ciampi for the tip, a FB friend.)

If I see your brake lights, then I know that you're going to do something. If you slow down and start turning onto a side street, then I know that you're going to turn on a side street.
Now let's say that you're going to slow down to turn but before you turn on your brake lights, you turn on your signal light giving me more warning so I'll have less of a chance to run into you and maybe kill you.
Did you know that just resting your foot on the brake pedal and long before the brakes are engaged, your brake lights go on?  (Site owner.)