Hi,
For those who have Kindle e-paper readers, I recently converted official NZ road code web site to Kindle format. NZTA copyright allows to reproduce its content for personal use.
You can download mobi file from here.

Please note that road code is a subject to update, my version is valid as of 14 August 2013. It does NOT cover heavy vehicles and motorcycles, only cars. It also can be tricky to read sometimes on black-and-white e-paper sentences about "driver of green car" but it's a minor inconvenience.

Enjoy!