When Transmission Gully opens it will become the main route in and out of Wellington and will be assigned the SH1 designation. As the current section of SH1 between Linden and Mackays Crossing will remain a state highway until a decision is made on its future, it will be renumbered SH59. The renumbering will take place on Tuesday 7 December. Despite the change in state highway number, the route will not change.
This is part of a wider project to ensure the existing state highway network, and everyone who uses it, is ready for the opening of Transmission Gully. Renumbering this section of highway in advance of the opening allows clear and appropriate signage to be in place to ensure clear communications in the event of crashes or incidents, and help people – whether locals, visitors, deliveries or emergency services – find their way around the network easily.
Renumbering this section of road as SH59 will signal that Transmission Gully, as SH1, is to be the spine of the state highway network and carry the majority of inter-regional traffic, especially freight.
The below maps show the current highway numbers, and the new highway numbers that will take effect when Transmission Gully opens.