Add to this the the abysmal rate of turn signal use and the increase in entirely preventable collisions due to absent (or misunderstood secondary) indications o

Add to this the the abysmal rate of turn signal use and the increase in entirely preventable collisions due to absent (or misunderstood secondary) indications of driver intent, all of which I highly suspect is nearly one-to-one correlated with an increase in turn signal hands now occupied by phones, which even when not being an active distraction to the driver nonetheless discourage using one's free hand to indicate to the rest of the world how they should accommodate whatever plans you may have for the several thousand pounds of metal you are controlling.