CERA took over the management of Christchurch's central city cordon two months after the February 2011 earthquake. During its peak the cordon area represented the largest construction site in the southern hemisphere. This constantly changing, high-risk environment required strict health and safety processes including regular, compulsory contractors meetings and the enforcement of stringent cordon rules. The low number of health and safety incidents over the cordon's lifespan has been directly attributed to these sustained and thorough processes.