It was created as a state enterprise in 1945 in post-war communist Poland, until recently it had a monopoly on suburban bus transport in Poland. Recently it has been broken up, with many new companies being privatized.
PKS buses involving in two major crashes in Poland. In one - in 1978 - 30 people died, when two buses plunged into lake from 18m bridge in aeration of 15 minutes. In two - in 1994 - a overcrowded bus collided with tree and 32 people die in worst road disaster in country.