There are some useful resources that are available about the transport of overdimension and overweight loads, as well as for other road users.

Factsheet 53A

This is the NZTA Factsheet that details the transport requirements for the smaller Category 1 & 2 overdimension loads

NZTA Resource: Sharing the Road Safely with Trucks and Oversize Loads 

This info from NZTA provides advice for road users when driving with trucks on the road, and in particular when sharing the road with overdimension loads