Red flag introduction: There are three red flags on each bridgehead, symbolizing the people's communes, the Great Leap Forward and the general line in the 1950s. After its completion, the bridgehead with three red flags became popular all over the country and was imitated many times. From the 1960s to the 1980s, it became one of the city symbols of Nanjing. To this day, the Nanjing Yangtze River Bridgehead is still a famous tourist attraction.