When I first moved to Washington state, I would see mystifying traffic warning signs that would announce "Traffic Revision Ahead" as I was driving and then be in the midst of roadwork and lane changes a few seconds later.
I don't recall exactly what signs said in my home state of Nebraska for this situation but I think they would post a sequence of signs, a "Roadwork Ahead" followed by a "Lane Changes Necessary" indication. Either that or a display of "Detour Ahead" before the work.
Once I understood by context what I was in for when I saw such signs, I used to imagine a civil engineer sitting at a desk thinking "I have a vision; No... I have a revision".
Is this usage of "Traffic Revision" known anywhere else in the English speaking world, or is this a coinage specific to Washington state in the United States?