this is a bit of that subject, but last night i was travelling along heaslip road, where a fatal car crash had occured, even though you could see the flashing lights. no agencies would advise cars of detours, the smart thing they couldve done was there was an intersection about 250 meters before the scene they shouldve been detouring people down this side road, this wouldve saved people having to drive down near the scene and then drop a u turn because they have found out that you cant get through, when i went through there was quite alot of congestion.