Road closure without warning signage and a very dangerous diversion

Road closure without warning signage before you reach it, no reason or duration displayed on this vital route between busy locations and with only a very long /dangerous diversion in place over several blind humpback bridges. Needs proper signage before you get to it and information for those who use the route regularly as to when it will be open again. The diversion in place nearly caused my husband to be in an accident this morning over one of the dangerous, blind, single width humpback bridges.