In accordance with GB/T 39559.2-2020 "Technical Specification for Operation Monitoring of Urban Rail Transit Facilities – Part 2: Bridges" and Q/CR 757-2020 "Technical Conditions for Monitoring the Operational State of Railway Bridges," safety monitoring systems shall be installed on bridges with a main span of 120 m or greater, and on cable-stayed bridges with a main span of 150 m or greater, to perform safety monitoring.
