Risk early-warning study of passenger flow in business district

Recently, stampede accident in crowd-gathered place has become a hot topic in the research of public security. As a typical crowd-gathered place, the large business district is one of the most crowd places in the city. This paper studied the risk early-warning method of passenger flow in business district from four aspects: regional density, flow rate of the section, bidirectional flow ratio of the section and mean velocity, and compared the advantages and shortcomings of these methods. All these are significant in preventing such accident and constituting the emergency response.