I think it's silly to rely on any device, no matter how accurate, there will always be changes and you may get caught out when the device fails to warn you. Just rely on your instinct and pay more attention to the road would me my advice.
True, that is the best advice although I have never gone past a fixed camera, yet, that is not on their database. It will happen one day of course but I don't ignore instinct or pay any less attention to the road because of this. That really would be stupid
