Earlier quoted context omitted.
Sometimes liberties are taken here, such as California originally separating carpool lanes with yellow lines (when they should have been white). Presumably they felt that even though yellow was incorrect, it sent a clearer "do not cross" message to drivers. They were later ordered to change them to white.
I noticed that change recently and assumed it was motivated by Tesla. There are certain things we all take for granted when driving. A huge one that we probably don’t give much conscious thought to us this: How do we know if the lane to the left is ok to go in, or if it actually is for carrying oncoming traffic? You’d like to think that one way though not the only way, is to look for a double yellow line. As in, doub…
Imagine a tourist on that highway for the first time, at 3am, when there’s no traffic. Can they use that lane? Can they pull a sneaky u-turn and start driving the opposite direction?
What if I’m driving down the highway, effectively on mental autopilot, and suddenly become aware that I’m on the “wrong” side of the yellow line? How would I be likely to react?
The opportunities for misunderstanding by normal humans seem plenty.