On hiking protocols: among Japanese hikers there seems to be a pretty consistently observed etiquette / protocol for passing priority when two groups meet on a narrow trail. 99% of the time, the ascending group has right of way. 

I think this makes sense: ascending is more taxing than descending. The overall system should help maintain the flow and focus of the group in the midst of the harder activity. 

Last week I went hiking around in Canada for the first time in a decade (Joffrey Lake, British Columbia)

There was no apparent priority protocol, maybe because so many of the hikers were tourists (just like escalator protocol breaks down in Singapore in neighborhoods that mix left and right side tourists)

Similar thing on bridges with cycling paths – cities put in chicane gates to prevent kamikaze 60km/h descents in a narrow corridor. Gates are single file, with priority to ascending traffic

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