I've said it before, and I'm going to say it again. Never trust navigation apps blindly, and always, but always – and I can't stress enough how important this is – pay full attention to traffic signs on the side of the road.

   

A case from Toronto proves how critical it has become to never take for granted what the sat-nav says. Google Maps has mysteriously started sending drivers the wrong way on a one-way street, obviously causing a massive disruption in the neighborhood.