AtB AS is a public transport manager for Trøndelag county and is managed as a corporation. AtB's task is to plan, order, market and develop public transport in the county. Tariffs are set by the county council as part of the budget process. AtB has three main sources of funding: Ticket revenues, grants from the Trøndelag County Municipality and the Environmental Package. AtB has a customer center at Prinsens Gate 41 right beside the bus stop Prinsens Gate P2 in Trondheim. AtB took over as public transport manager for bus traffic in Trondheim in 2010, tram traffic on Gråkallbanen and other bus traffic in Sør-Trøndelag county in 2011, speedboat routes in 2012 and 2014, ferries in 2015, and in 2018, the former Nord-Trøndelag county was also incorporated after the two counties was merged into the new county of Trøndelag.
