TCMS 3rd Party Checker

2026-11-03

National Highways is in the process of delivering the new Tunnel Control and Management System (TCMS) for the first phase of the systems deployment at Hindhead Tunnel. Hindhead is the first tunnel from National Highways portfolio of 11 tunnels to be migrated onto the new TCMS. The TCMS is classed as a Tunnel System and as such it’s design and development is required to comply with CG300 technical approval of highways structure and CD352 Design of road tunnels. To satisfy the standards, National Highways require an independent design checker to undertake Category 3 Checking and an independent functional safety assessor to undertake functional safety assessments of the design and implementation of the TCMS. The TCMS has completed the majority of the design and test phases and now requires completion of the fault free running period, trial period and safety case which will allow issue of the final certification. There are changes required to several design and test documents which require completion of the Category 3 Checking before issue of the design certification. National Highways are also seeking Approval in Principles (AiP) for both Southwick and Roundhill Tunnels. These AiP’s are necessary to progress the approvals of planned tunnel refurbishment schemes at the tunnels in compliance with CG300 and CD352 and to move the schemes into detailed design for the tunnel refurbishments.

United Kingdom (UK)

2026-09-21