An economic downturn and then rapid economic growth have imposed large structural changes on the city and its transport system. The number of private cars has been increasing rapidly and the public transport network has not developed at the same pace as the private modes and faces huge competition. Between 1990 and 2000 public transport use fell from 250 to 94 million and the modal share of the public transport in Tallinn decreased from 77% to 31%. The decline in the quality of public transport has affected virtually everybody in the city, but most of all women, children and elderly people who are most dependent on it. The massive shift to private car use has also damaged the city environment. The old part of the city has been declared a UNESCO world heritage site and it is in urgent need of actions to prevent damage caused by traffic. The existing public transport network (bus, trolleys, tramways and suburban trains) needs to be renewed and extended so as to support sustainable urban development.