Some residents in the Waterstone subdivision are concerned that the new expressway will pass by their homes, and have an impact on their quality of life and property values. http://www.stuff.co.nz/dominion-post/local/2783252/Fears-for-homes-from-road-plan
These people have legitimate concerns. They bought their properties in good faith without knowing that a new road would be going close by.
Here's an alternative: use the whole of the Western Link Road corridor to build the new State Highway One expressway. The land's vacant - and most of it has been owned by the Crown for decades. The new expressway could cut across the northern corner of Queen Elizabeth Park and follow the route of Western Link Road. Not only would it make the road more accessible to the people of Raumati, Raumati Beach and Paraparaumu Beach, but it would be using land that's already designated for roading purposes.
And after all, if people bought houses next to land designated for roading, they can't really complain, can they?