Just received this email from NZ Transport Agency, asking for submissions of interest on the increase of the speed limit to 110km for 64km of the expressway.
If your interested here's the information.

Formal consultation on new speed limit proposals is required under the Land Transport Rule: Setting of Speed Limits (2017).

Before we make a decision, we want to hear from you.

How to respond

Feedback on the 110km/h speed review is open from today, 26 October, until 5pm on Tuesday 23 November 2021.

Submissions can be emailed to waikato.speed.reviews@nzta.govt.nz, or completed online at https://www.nzta.govt.nz/projects/waikato-expressway/sh1-waikato-expressway-hampton-downs-to-tamahere-speed-review/have-your-say/ 

People can also download a consultation form from the same webpage and post it for free.