And it seems likely that one will now be retrofitted after Finance and Infrastructure Minister Steven Joyce signalled his support for it last week while addressing local businesses about what to expect in next month’s Budget.

Joyce said he supported an interchange north of Waikanae and believed it would happen eventually, Kapiti Coast Chamber of Commerce chairwoman Heather Hutchings said.

Stuff article

You wonder why this wasn’t put into the design to begin with.  It will be a lot more expensive to retrofit one than it would have been while the ‘Ewy’ was being built:  see this post.