Virtual Wall by WeiQichong from china

When the subway doors are closing, people possible will being clamped if they rush into the carriage. And that may result in security incidents. 『VIRTUAL WALL』, a security device installed in the subway door, is achieved by plasma laser beam. When subway train doors are closing , 『VIRTUAL WALL』 will cast a cautionary pattern, to prevent people rush into the carriage, effectively prevent people from being clamped by the subway doors, thus avoiding incidents occur.