MB4F (Make Beijing Four Free), also known as Beijing for All, is a city-wide campaign led by local residents that aims to promote public participation and make public transportation in Beijing completely free for everyone. MB4F works to ensure that public transportation in Beijing is accessible and affordable for all by advocating for the removal of public transportation fares. This campaign has seen significant success, with thousands of individuals attending rallies and demonstrations in support of the movement. The goal of MB4F is to make sure that public transportation in Beijing is available, accessible, and free of charge, so that citizens can move around the city freely and easily. At the same time, the campaign hopes to improve the quality of life in the city by reducing traffic congestion, improving air quality and making sure that everyone has access to the transportation they need.