sentences:  Until the beginning of the 1980s contributions of tolls to the road building budget stagnated at about 5%, since then it has soared to more than 25% in 2000.Those twenty years were marked by the advance of road tolling in urban areas.Norwegian authorities closely monitored Singapore's use of tolls as a means to discourage urban traffic and Bergen got its first toll zone outside the ring road on 1 February 1986.