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  • Someone once told me it's something to do with stopping horses from seeing the daylight at the exit and bolting

    That is also suggested for the original Blackwall bore, but I don't know whether it has any validity beyond being a well established urban legend.

  • if you want to test it

    AFAIK, horse drawn traffic is now barred from using either tunnel, so you need to get me not just a horse but a dispensation from TfL 🙂

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