I do a lot of road planing with my truck (have done today in fact) and as you say, nowadays most works are signed well ahead. It does get confusing when two seperate places are closed , so you have two sets of diversions ("which do I follow?"), but my most often asked question, normally after a car has followed me for the last 3 miles, past 4 or 5 'RAC' signs and we get to the closure with the Road Closed sign (where I put on my flashing lights and go through). I often wait for the guy behind to get out of the car and come up to me with the inevitable question "can I get through here?". I reply "what does the sign say?". He says "road closed". I say " which of those two words have you got a problem with?". It never ceases to amaze me how often people will drive 4 or 5 miles past loads of pre warning signs and are really annoyed to find the road really is closed!