merge with several math : who "wins" ?

[Marc-marc-marc]

What happens if there are several candidates for a merge? Is the closest one the match ?
Related to charging station merge in France : 100m inside a highway=services is unfortunately not enough I've just merged a TotalEnergies station where the osm-opendata distance is 166m and I wonder what the drawback would be in increasing that to 200m in case of several candidates within a extended radius.
Related code https://github.com/osm-fr/osmose-backend/blob/master/analysers/analyser_merge_charging_station_FR.py#L71