On a visit to Las Vegas years ago, I was surprised to see at the downtown intersections, there is a moment when all the traffic lights go red, and people can cross the street diagonally ~~ cattycorner.

Does Las Vegas still have these crossings?
Are there OTHER CITIES where this is done?

Where do the words cattycorner and cattywampus come from, and what does cattywampus actually mean?

Love, Johnny