The relatives of those killed in the 2012 Carterton ballooning tragedy are being told steps are being taken to improve tourism industry safety.

A coroner's report into the crash that claimed 11 lives was released yesterday and identified pilot error and drug use as contributing factors.

Pilot Lance Hopping was known to be a habitual cannabis user - and Coroner Ryan says it's possible subsequent impairment lead to Mr Hopping making several errors which resulted in the fatal accident.

He wants the Civil Aviation Act to be amended so police and the CAA can undertake random drug and alcohol testing of adventure aviation pilots.

He also wants the industry to consider making safety briefings more comprehensive, and for operators to make the details of the certification and medical certificates of pilot's public.

Minister of Transport Simon Bridges says the families of those killed can take comfort there have now been a very comprehensive series of reports by multiple agencies on the accident.

"From the government, over a period of two to three years, very significant regime changes around drugs and potentially in light of what the coroner is saying, some more to come as well."

Bridges says the findings show drugs and transport are a lethal mix.

"I think both government but also society has to have a zero-tolerance for drugs in transport."