Ooh - also - the folks (usually seniors), who see you driving along, yet quickly pull out in front of you from a gas station or parking lot.....then drive much slower than you.
I know the type. You are driving along, and you see them waiting to pull on the road. But they just sit there. And sit. And sit. And you finally decide, I guess they are going to let me get by first, how nice. And then they pull out in front of you, forcing you to slam on your brakes, and then drive 10 mph below the speed limit.
It wasn’t that they were nice, it’s that they had no idea how to judge the speed of traffic, and took forever to react and make decisions.