44 Bowen Street
Private Bag 6995
Wellington 6141
New Zealand
T 64 4 894 5400
F 64 4 894 6100
www.nzta.govt.nz
12 September 2025
AJ
[FYI request #32017 email]
REF: OIA-19318
Dear AJ
Extension of time to respond to request made under the Official Information Act 1982
Thank you for your email of 15 August 2025 requesting the following information under the
Official Information Act 1982 (the Act):
I request all information held by Waka Kotahi NZ Transport Agency relating to the
assessment and model ing of traffic flows at the Cambridge Southern Interchange on the
Waikato Expressway.
This request covers information used to justify decisions not to upgrade the interchange
to ful access, including but not limited to:
1) When NZTA conducted its most recent traffic flow model ing relevant to the Cambridge
Southern Interchange.
2) Where the traffic data used in that modelling was sourced from (including specific
traffic counts, third-party datasets, or local authority data).
3) Population growth models for Cambridge used in that model ing, including the source
of those projections and the version/date of the dataset.
4) Any model ing assumptions, reports, and methodology notes relating to the Cambridge
Southern Interchange, including assessments comparing its location to the Victoria Road
interchange.
5) Any analysis or examples NZTA has considered when citing that the Cambridge
Southern Interchange is "too close" to Victoria Road interchange and would result in
mainly local traffic as reported
https://aus01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.cambridgene
ws.nz%2F2025%2F08%2Fupston-ramps-up-
support%2F&data=05%7C02%7Cofficial.correspondence%40nzta.govt.nz%7Cf733c15af
ab847599cf608dddbae60da%7C7245e48ca9ff4b2898ef05cfa8edb518%7C0%7C0%7C6
38908264323259749%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUs
IlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C600
00%7C%7C%7C&sdata=gJQxiOYfmix%2F6oIMkQg86CuY%2Fiqw8PdgKVwoRMSKmS
0%3D&reserved=0 . Including comparisons to interchange spacing elsewhere in the
Waikato Expressway or Hamilton area.
6) Copies of any NZTA/Waka Kotahi policies, guidelines, or criteria relied upon when
determining whether to upgrade the Cambridge Southern Interchange to a full access
interchange.
This letter is to advise you that NZ Transport Agency Waka Kotahi (NZTA) is extending the 20
working days available to respond to your request, as allowed for under section 15A of the Act.
We require an additional 15 working days and wil send you a response on or before 3 October
2025.
The extension is necessary as your request is for a large quantity of information and meeting the
original time limit would unreasonably interfere with our operations.
Under section 28 of the Act, you have the right to complain to the Ombudsman about the
extension. More information about the Ombudsman is available online at
www.ombudsman.parliament.nz.
If you would like to discuss the extension with NZTA, please email the Ministerial Services team
via email to [NZTA request email].
Yours sincerely
Prisca Gain
Team Leader, Ministerial Services
