>>1674850No need to build physical barrirs. We can just use existing technology to filter out the undesirables and the wrong thinkers and the singles and the incels and those kinds of people. The exiting millimeter-wave broadband signal within each station can be overlaid with the whitelist of authorized users tracked via their phones. Any human-like bodies moving around in the station not tied to a known-good user is an adversary that can be neutralized with a Boston Dynamics terror dog, which would be able to roam freely due to the absence of walls.
