This guide describes the processes to be used on NZTA asset improvement projects for assessing and, where required, determining appropriate mitigation for road-traffic noise. These processes are based on New Zealand Standard NZS 6806:2010. The guide also gives effect to NZTA's state highway project development and delivery standards, in particular SM030 Minimum Standard Z/19 - Social and Environmental Management. As such, this guide is aimed in particular at NZTA project managers; acoustics specialists and planners.

A summary of each section of the guide is provided on the following pages.  For further details, the full text of the guide should be referred to.

• Assessment method - this section describes the assessment of road-traffic noise as required by NZS 6806.
• NZTA processes - the three-tiered approach to noise assessment adopted by the NZTA is explained.
• Best practicable option - the actions required for NZTA projects during the determination of the BPO are presented.
• Designation conditions - this section explains the type of conditions that are appropriate.
• Examples - assessment report examples using NZS6806 are provided for a number of NZTA projects.