A landmark motorway once lauded for its green credentials is now racking up environmental black marks.
Transmission Gully is being operated near Wellington by a consortium of financiers and contractors since it opened 18 months ago.
Public-private partnerships, or PPPs, like this are known as a favoured way of the incoming government to pay for roads and infrastructure.
But it is not clear who can be held accountable as investigations continue into the Gully's impact on streams, native fish and one of the country's most sensitive inlets.
Phil Pennington spoke to Ingrid Hipkiss.