Our 2014 Jeep Grand Cherokee had this, a visible indicator along with an audible alert when you used the turn signal. It was useful and wish the F-150 had it. It could also be turned off in the system settings.
That's how the system worked in my 2019 Honda Ridgeline - liked it, wish the F150 did that.Let me add.. This alert would only chime if you hit your turn signal to change lanes and something was in your blindspot.
It is....that would be very annoying