Well it seems that the highways policy here in Britain is to schedule the work to cause maximum disruption, as well as to cordon off as many traffic lanes as possible then do nothing for months - and even when work starts, it is stretched out for the maximum possible time - I often see miles of road mending equipment (as I crawl nose to tail down the one remaining open lane on a 3-lane motorway) with no road workers anywhere in sight. Your idea is too sensible and potentially effective to find favour with the powers that be. ?