The problem here is that every junior programmer thinks they write clean code when they really really don't. Often I find the act of writing comments makes you go back to the code and clean things up, so it's still worth encouraging comments.
My guess is that it makes it easier for drivers to detect bends in the road, as the stripes are painted at equal widths, so you can visually tell in your peripheral vision when the road is starting to slope a corner.
The problem here is that every junior programmer thinks they write clean code when they really really don't. Often I find the act of writing comments makes you go back to the code and clean things up, so it's still worth encouraging comments.