When I was creating my own route last year, one solution for passes with seasonal closures, was to change to "Walking" mode rather than car or motorbike. One of the passes only reopened a week before we travelled. When they had reopened we changed back to Car/motorbike mode, to check the approximate travel times made sense. The additional waypoints/shaping points were left in as they only helped anchor the route when distributed to the others in the group.
Caution: check the route and put additional points if it uses routes only passable by foot.
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