SHANGHAI’S transport authorities and the operators of the Shanghai National Exhibition and Convention Center said yesterday they will urge exhibition organizers to improve the accuracy of their visitor number estimates after the staging of three medical fairs last weekend caused chaos.

Shanghai Expo Co, which runs the National Exhibition and Convention Center, also said it will launch a mobile phone application and add more signs inside the center to help visitors navigate.

Reed Sinopharm, which organized last weekend’s health care events, estimated that they would attract 110,000 visitors on their first day, which was Friday. The actual number was 173,000, said Wang Zhiping, chairman of Shanghai Expo.