That are the rules for giving way or yielding to other vehicles in New Zealand?

The general rule is to give way or yield to vehicles on your right. Vehicles approaching from the right have priority at intersections without signals or signs. Yield to vehicles on the roundabout and at stop or give way signs. Pedestrians have right of way at crossings. When merging, yield to vehicles in the lane you're entering. Emergency vehicles always have right of way. Follow road signs and markings. For more detailed information, you can refer to the official New Zealand Transport Agency page on giving way rules.