Questão jurídica principal
Whether the canton violated the City of Geneva's municipal autonomy by regulating zones 30 and meeting zones by statute.
Decisão extraída
No violation: the commune had some latitude in selecting locations and preparing projects, but no autonomous regulatory or decision-making competence in this field.
Fundamentação extraída
Federal and cantonal law exhaustively regulated the legal status of these traffic zones and reserved formal decisions to the cantonal department. The cantonal legislature therefore did not intrude on a constitutionally protected municipal domain.