the split of Cote-de-Liesse and transcan is correct, however, the turn around lane that goes under the highway goes to both the Route Transcan AND Cote-de-Liesse.
at the point of the turn around street, the seperation of the two roads is by paint only.
imideatly after the turn around street, the two roads are devided by permanent cement median.
this is a more complicated edit then I feel confident to make with my limited editing experiance.

as of this feeder lane, till the street splites into a Y, (for going to each direction of Cote-de-liesse), there are 3 lanes

there is a(n aditional) turning lane ony on Chemin de la Cote-de-Liesse for this side street. it starts about 1/4 of the way back from this street and the previous side street.
I am not sure how to add an additional turning lane only for a short segment in ID.

roughly the start of the one way only turning lane for the next intersection

there is a(n aditional) turning lane ony on Chemin de la Cote-de-Liesse for this side street. it starts at the one way feeder side street shortly west of this.
I am not sure how to add an additional turning lane only for a short segment in ID.

Unable to answer "What’s the height of this curb?" for osm.org/node/10966100966 via StreetComplete 56.0:

Stairs to go around this corner

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https://westnordost.de/p/193520.jpg

Closed during winter. Don't know how to input that in opening hours, as i do not have the summer open hours.

via StreetComplete_ee 50.1_ee

Attached photo(s):
https://westnordost.de/p/133090.jpg

Sidewalk blocked

via StreetComplete_ee 50.1_ee

Attached photo(s):
https://westnordost.de/p/128600.jpg