The 'car-free day' initiative is an annual event part of European Mobility Week which aims to promote sustainable modes of transport.
It was launched by European Commission (EC) environment commissioner Margot Wallström and vice-president Neil Kinnock.
The EC said European Mobility Week focused on the benefits of sustainable means of transport and policies that improve air quality, reduce noise and enhance people's quality of life.
European Car Free Day took place on September 22 and involved more than 900 cities in upwards of 20 countries. Participants were challenged with organising what was called 'In town without my car' on a working day.
The event was first held in France in 1998 but was established as a European initiative by Wallström in 2000.
A Commission spokesman said: 'It is an opportunity for all participating cities to show how matters related to the environment concern them. Presenting our urban centres in a different light for one day by restricting motorised traffic in certain areas, encouraging the use of sustainable modes of transport and raising awareness for the environmental impacts of citizens' modal choice are the key types of actions implemented by the local authorities.'