One of the things I've wondered about with these tunnels is how they prevent drones from just entering at the "end" of the tunnel. Do they have a net curtain or something that a car can easily drive through/under, just pushing the curtain aside, or do they basically just hope that drones don't get inside?

Also, another thought just hit me: Wouldn't it be a nightmare for logistics if someone just decided to target the poles holding up the nets? I would imagine that you could make a road basically impassable by hitting every other pole for a couple kilometers, and that could be done in a coordinated attack, since the poles aren't exactly moving anywhere. Obviously, this isn't something being done, so I'm really just wondering why?