Throughout the project, the RTA consulted with various stakeholders about the road changes as required by law. Government agencies including the DoP and various Councils contributed to the tunnel's design. The RTA prepared and put on public exhibition the environmental impact statements, representations reports, and preferred activity reports. The RTA considered the public's comments, and made significant changes. For example, the single lane of access from Cowper Wharf Roadway to the Domain Tunnel and Macquarie Street was reintroduced following the Supplementary EIS.