The intersection owes this name to the dangerously poor visibility caused by the three railway overpasses immediately to the north, east, and west of it,[fn 1] and by concrete retaining walls on all four corners.
As part of an effort to make the intersection safer, advance signals were installed on the Iberville north and Saint-Joseph east approaches, where flashing yellow lights warn motorists that they are about to come to a red light.
[3] In September 2001, then-minister of transportation Guy Chevrette cited this particular intersection as an example of a place where it is too dangerous to post a patrol car and highway code enforcement would thus benefit from the use of photo-radar.
A major Canadian Pacific Railway line uses these two overpasses, making it impossible to demolish them in the short term.
[5] According to the Ministère des Transports du Québec[citation needed], the tunnel should have been completely demolished and reconstructed by July 2010.