Well, no one really knows why this change was done overnight. Is this a long term change or just an experimentation ? God only knows. What I can say is that it could have been managed sensibly. There was no notification in newspapers or announcement regarding this new diversion. I understand that traffic jams are unpredictable, but in this case with prior notification vehicles would have taken deviation at the previous junction(s) itself, minimizing the traffic pile up and thousands of people wouldn’t have spent a frustrating one hour on the roads.