• I know, rhetorical question, but I doubt it!

    I've visited London twice and some of the subways it is mission impossible to "just face away" as the carriages are too narrow and, oh, you sit facing each other. FFS if even the visitors go "em wait, what????"

    And it won't fix the problem that there is probably a lot of nicely contaminated recycled air.

    Least bad case scenario is a local bus/train with lots of room where you can open a window, if that is packed and some people don't want the windows opened, you are still in a closed room with icky air....

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