In Utah no one uses their turn signal. Using your turn signal guarantees you will not be allowed to turn or change lanes. If you broadcast to another Utah driver that you intend on moving to some part of the road they will make sure to take over that part of the road and give you dirty looks. Kind of opposite of most of the country where signaling allows other drivers to make space, in Utah it naively gives other combatants insight into your next move.
So this attitude/ cultural particular stops people from checking their signal/ brake lights on a regular basis? Once a month, when doing laundry at the folks place, I have my Dad confirm my lights when standing behind my car.