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For some reason if that were to ever happen where I live, which is an impossibility, I can't imagine the City would let people go on them due to liability issues - fear of law suits from stupid people hurting themselves.
Nice find. That first one is not Amsterdam though, it's Leiden.
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“A developed country is not a place where the poor have cars. It’s where the rich use public transport”
– Gustavo Petro, Mayor of Bogotá, Colombia