I don't like advertising on highways, just one more distraction and makes them look a mess. BTW, there is zero advertising allowed on the Autobahn, the closest you get is the standard traffic sign indicating a gas station or lodging ahead.
Check the accident rate on the Autobahn: Something like twice that of similar US roads.
Think about it. The opposite of distracting is boring. In West Texas, you look forward to billboards.
California is a big state. one sign here by a Riverside freeway for a local project is Verboten? gimme a break.
we have traffic advisory signs all over the place these days..