Inspection Policy and Procedures for Rail Transit Tunnels and Underground Structures

TRB Transit Cooperative Research Program (TCRP) Synthesis 23: Inspection Policy and Procedures for Rail Transit Tunnels and Underground Structures describes the current state of the practice for specific management policies and procedures and engineering/physical techniques used to inspect rail transit tunnels and underground structures. It discusses the available data on, different approaches of, and potential data inadequacies for agency rail transit tunnel inspection policies and procedures and inspection techniques.