These types of operators are governed directly by regional/local transport authorities who define the level of service, fares and coverage. In some instances, national authorities also set requirements for these operators, especially in return for payments and subsidies. However, this model may harbour some inherent tensions in that officially partnering with innovative mobility operators, especially those that have limited or no public service obligations, may be seen as running counter to the agency mission. This is one of the reasons the US Federal Transit Administration has issued guidance on the matter.