The New Zealand give way rule is due to be changed in early 2012. The latest version of SIDRA INTERSECTION (version 5.1), released in April 2011, has a convenient feature for changing the models from 'New Zealand rule' to 'Standard left model'. For more information, please see pages 6 and 16 of the v5.1 update notes.
To learn more about SIDRA modelling in New Zealand, industry training courses are available in Auckland in October 2011.