I'm living in a country where lot of tunnel on the road. I all the time facing the problem where I have no time to change the lane at the exit of the tunnel, because the signal lost in the tunnel, and when the device lock the signal again there not enough time to take the action.
It would be nice to warn the user "you driving into the tunnel at the tunnel exit keep left" or something similar.
Yes I know I can see the next action when the gps signal lost but if I don't know how long is the tunnel I'm not sure the next action will be right after the tunnel exit or later needed.