NZTA plans safety work at SH6 Nevis Bluff 30 January 2009 12:00 am | NZ Transport Agency The NZ Transport Agency (NZTA) advises that from Monday 9 February 2009 it will be doing safety work on State Highway 6 at the Nevis Bluff, about midway between Cromwell and Queenstown, which could cause some traffic delays.