Before ruling on an application that raises a new question of law, presents a serious difficulty and arises in numerous disputes, the Commission du contentieux du stationnement payant may, by a decision that is not subject to appeal, refer the case file to the Conseil d’Etat, which shall examine the question raised within a period of three months. Any decision on the merits of the case is deferred until the Conseil d’Etat has issued its opinion or, failing that, until the expiry of this period.