Police posted on the centre median embankment at the end of the Ville Marie tunnel, next to the exit for "Saint Laurent north" (which splits and goes to Saguinet and St Antoine). They are hidden by the final curve of the tunnel and catch drivers as they come out of the main section of the tunnel. I’ve seen this trap two or three times during mid-day during the summer. Posted limit is 70 kmh, as a rule try not to exceed this in this part of the tunnel even though traffic always goes faster.