Why won't drivers use thier turn signals?

Simple math: one hand on cell phone, other hand on coffee mug, right foot on gas pedal, left knee for steering. What do you want them to use to activate the turn signal?

Contrary to the lazy theory... What's the common driver's reaction to someone in an adjacent lane signaling to come into their lane? They speed up and close the gap. Why give those drivers the courtesy of the signal when in return they just rob you of your opportunity?

> Why give those drivers the courtesy of the signal when in return they just rob you of your opportunity?

To avoid an accident.

Bottom line: too lazy to use it.