I guess I must be an idiot. I frequently can't tell what turn the navigation system expects me to take and I am never sure if it's really 100ft or more-or-less 100ft, maybe 60, maybe 140. When the navigator tells me I can be in the leftmost 3 lanes for the turn, I usually can't see whether I should be ready to turn left or right. If I can't see the turn, because there is a truck in my way, I will often miss it. But I must be in a subpopulation that doesn't need any support because we're so rare.