Over the year of their operations the Czech SOR electric buses have already transported more than 600 thousand passengers on their regular BB1 and BB2 routes, which join the multifunctional BB Centrum with the Budějovická metro station. Since February of last year the electric buses have travelled more than 40 thousand kilometres. The implementation of electric buses into the Prague mass transit system is a joint project of the development and investment company PASSERINVEST GROUP, the ČEZ Group and the ARRIVA transportation company, which want to contribute to an improvement of the environment and a decrease of the traffic noise in BB Centrum and its environs.