I read that as a sloppy way to say that the right lane allows turning, rather than requires turning. Otherwise, it makes literally no sense, as you say. Most

I read that as a sloppy way to say that the right lane allows turning, rather than requires turning. Otherwise, it makes literally no sense, as you say. Most people don't post utterly logically inconsistent ideas. Usually, they just screw up English and mean one thing when they say the other.