If you look at the Mazda 3 or 2018 Leaf, if you turn the turn signal in a direction where someone is in your "blind-spot", you get an audio indication that you are about to do something likely cause an accident, as you should. However on the Bolt, you get no such indication and, at most, you have a light flashing at you from the relevant side view mirror but no immediate indication that just told the car you are planning to do something dangerous. From our (myself and my wife), this makes the blind-spot detection essentially useless for no other reason than that GM did not follow common common sense and common practice. It is also the only reason that we are not buying a Bolt!