Here is a snippet from Worksafe:
Under the Health and Safety at Work Act 2015 (HSWA), every business has a responsibility to ensure, so far as is reasonably practicable, the health and safety of workers, and that others are not put at risk by the work of the business (for example, customers, visitors, children and young people, or the general public).
First, you must always eliminate the risk where you’re reasonably able to. Where you’re not reasonably able to, then you need to consider what you can do to minimise the risk.
The following are examples of only some of the health and safety risks for people in the road works sector. WorkSafe NZ also provide general guidance on how to manage your work health and safety risks.