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Overnight closures of Johnstones Hill tunnels


The NZ Transport Agency is advising motorists that the Johnstones Hill toll road tunnels will be closed overnight for three consecutive nights from Monday 20 April while work is carried out to upgrade the tunnel’s traffic management systems.

A detour will be in place using the Hibiscus Coast Highway between Puhoi and the Silverdale interchange (in both directions), which will add approximately 15 minutes to journeys.

Another period of overnight tunnel closures with a detour in place is planned for 18 to 21 May.

NZ Transport Agency highways manager Brett Gliddon says the upgrade work will replace the tunnels’ original ‘backroom’ management system with an expanded version of the Transport Agency’s Automated Traffic Management System (ATMS) which manages traffic and monitors safety systems for the motorway network.

The system provides traffic and incident data to operators in the Auckland traffic control room (ATOC) which monitors traffic flows and manages emergencies for the region’s road network, providing up-to-the-minute information services to the travelling public through a variety of outlets.