“In every study that considered the question”

I spent most daylight hours yesterday driving in torrential rains in pretty bad visibility, and I was astonished how many cars didn’t have their lights on. It looked something like this. The cars with tail lights on were somewhat visible, but the cars without them didn’t stand a chance: I read up about it, and it turns out that the issue wasn’t as much forgetfulness or carelessness. Rather, it all might have to do with iconography. Cars have two main settings for lights: “regular driving,” meant to be used at night and during limited visibility – like in heavy rains, “parking,” which activates only front lights, at half brightness, and (for some reason) leaves the tail lights off. The UI for lights seems to typically look like this: Without knowing, can you figure out which setting is which? The left icon with two lights facing away from each other means the parking lights. The far-right icon with one light pointing slightly down (“low beams”) is regular driving lights. The latter is…