People use public transportation on World Car Free Day in Ljubljana, Slovenia, Sept. 22, 2025. (Photo by Zeljko Stevanic/Xinhua)

Children learn what they need to know as public transport passengers on World Car Free Day in Ljubljana, Slovenia, Sept. 22, 2025. (Photo by Zeljko Stevanic/Xinhua)

A man walks out of a central metro station in Warsaw, Poland on Sept. 22, 2025. Public transportation in Warsaw was free of charge for all passengers on World Car Free Day, part of the European Mobility Week to promote sustainable urban mobility. (Photo by Jaap Arriens/Xinhua)

Passengers enter through ticket gates at a central metro station in Warsaw, Poland on Sept. 22, 2025. Public transportation in Warsaw was free of charge for all passengers on World Car Free Day, part of the European Mobility Week to promote sustainable urban mobility. (Photo by Jaap Arriens/Xinhua)