Question juridique clé
Whether the Geneva amendment creating incompatibility for TPG board members violated communal autonomy
Solution extraite
The canton could regulate the composition and incompatibilities of the cantonal public-law entity; the communes had no protected autonomy to freely appoint their TPG representatives.
Motifs extraits
TPG is a cantonal public institution fully governed by cantonal law. The former constitutional wording did not guarantee free choice of representatives, and the cantonal legislature could restrict communal prerogatives, especially to comply with federal transport law.