Tagging cycling roads on levees.
Levees have construction projects that can be years in length (building a new
sluice gate, enlarging the levee), and the route is detoured around this
construction.
https://www.openstreetmap.org/#map=16/36.1327/139.7509
Route=detour exists for *permanent alternate* routes that exist in addition to
the existing route (per the wiki).
But For these detour segments on the cycling route I am mapping, they are the
*only option* (the regular route is physically gone), so I’m thinking the route
relation role=detour onto these ways.
In this particular example, the detour route was destroyed by the typhoon. I
mapped a second detour route above.
Javbw
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