On August 15, a theme event focused on following the right signage was held on GONGYIXIQIAO Station of BJL4. A big floor sticker with many metro signage became the playground on which the passengers could play as the chess, by playing they get a better view of how to follow the right signage when taking the metro.
Since the opening of BJL4, more than 1000 pieces signage were replaced or updated based on the operation need.