OBS_VALUE: The National Port authority and the regional port authorities may temporarily grant the administration of port infrastructure to the public sector without an excusive use of such infrastructure for the rendering of essential port services that are rendered in free competition. In consequence such economic operation may not prevent the access of intermediary users to the port infrastructure that is required for them to provide their services. However, the Transport and communication Ministry and the competent port authority may define the convenience of granting an exclusive use over the port infrastruture. Moreover, in case of a concession that is granted for the purposes of developing, building and equipping at the sole risk of the bearer of a new infrastructure, its exclusive use may be granted.