Traherne Island is owned by the Crown and managed by NZ Transport Agency. The Northwestern Motorway runs along the island and connects it to the mainland by causeways and bridges.
Footprints of banded rail were found on the island in 2010. Surveys have found no archeological sites on the island.[1]
References
^Waterview Connection - Assessment of Environmental Effects: Part C. New Zealand Transport Agency. August 2010. pp. 8.12–8.14.