Do you mean you're temporarily closing the road to traffic and need to know how to handle the bike detour? I would say regular road closed signs, but with advanced notice and make sure your detour is safe for bicycle traffic. Bicycles are legal users of all non-controlled access roadways, so cyclists should be considered whether there is a dedicated lane or not, and cyclists have to follow regular road signs. I assume the MUTCD 2009 edition doesn't have anything for construction signing in bike lanes?