Regulation attends to improve the welfare of consumers, when imperfect functioning of the market. The crucial point is the choice of the rules and the instruments, but also the structure and the governance of regulation are very important arguments, especially since when the Italian (national and local) institutions have decided to create proper organisations: the Authorities. These structures are the objects of this work, in particular about their objectives, the relationship with the politicians, the size of their powers and, last but not least, the mechanism to determine their competence and to limit their discretion. Then will be presented the laws of four Italian regions on the new order of local public transports, a demonstration of the necessity of regulation’s Agencies and a challenge for the local governments: so it is possible to try to evaluate the first difficulties that functionaries and regulators will have to face up, and the costs for local communities at the beginning of the activity of these organisations.