A note about vehicles: the rental I'm in this month has various sonar sensors that sometimes are quite startling, but are effective now that I know what they're doing. I've realized that the lights in my Pathfinder that tell me about sonar stuff don't do much, and I'm thinking that the previous owner must have programmed the vehicle to not use the features. So I'll be reading my owner's manual to see what I need to do to activate them.