Hi..I'm new to this forum, so forgive me if I've started in the wrong place! I just wondered if there was any way of updating Sat Nav devices to warn lorry drivers not to follow a suggested route to a Postcode? The road suggested is completely unsuitable and unsafe for large vehicles. Its a farm track filled with potholes, tight turns and small bridges as well as homes that lorries come within inches of colliding with. Warning signs posted at the entrance of the road do not seem to matter! Can anyone help?