Where is the world's longest publicly accessible purpose-built pedestrian tunnel?
- List of long tunnels by type, bicycle and pedestrian. This is incomplete, as the only long pedestrian tunnel I've been in, the 1.6 km Niwärch tunnel (photo), was unlisted until I added it. Worse, many of the entries are not pedestrian tunnels, but tunnels for disused railways now open to the public. That's cheating.
- A category on pedestrian tunnels, which is even more incomplete (only 13 entries!).
Where is the longest purpose-built pedestrian tunnel in the world? By a pedestrian tunnel, I mean a tunnel that, when built, was not designed for anything larger than a pedestrian or possibly cyclists. For example, the Niwärch tunnel counts; built for water + human but has always been publicly accessible, but does not fit anything larger than a pedestrian (the watercourse is less than a metre wide). Disused railways that are now open to foot and bike traffic don't count. For the purpose of my question, it should be a simple tunnel connecting A to B; large networks of underground pathways such as the Toronto PATH do not count, for the same reason that the Shanghai Metro does not count as the world's longest railway tunnel.