Re: "Red X on tunnel"
Of course, because using the Lane Closed sign for "Queue Ahead" is so obvious!
Oh, those signs are there as well, further back, but the Craigies of this world don't read them.
Closing the outside lane and funneling the traffic into two lanes before the tunnel moves the queue to the input side of the tunnel, where it's easily seen, away from the long curve through and after the tunnel where it then flows more freely.