Kia ora Lewis

This email acknowledges your below request for information made under the Official Information Act 1982.

Your request has been forwarded to the appropriate section of NZ Transport Agency Waka Kotahi for response. They will contact you if they require clarification of your request, more time to respond, or if your request has been transferred to another organisation to respond to. Unless more time is required, NZ Transport Agency will send a response to you within 20 working days of receiving your request – in this instance on or before 28 October 2025.

If you would like to discuss your request with NZ Transport Agency, please contact us by email at [NZTA request email].

Ngâ mihi

Ministerial Services
Te Waka Kôtuia | Engagement & Partnerships
NZ Transport Agency Waka Kotahi
Connect with us on Social Media

-----Original Message-----
From: Lewis T <[FOI #32419 email]>
Sent: Monday, 29 September 2025 10:55 pm
To: Official Correspondence <[email address]>
Subject: Official Information request - CAS Data Quality

[You don't often get email from [FOI #32419 email]. Learn why this is important at https://aka.ms/LearnAboutSenderIdentific... ]

Dear New Zealand Transport Agency,

Kia ora

As a member of the public with a keen interest in evidence-based policymaking, I am writing to better understand the governance and quality assurance frameworks that underpin the Crash Analysis System (CAS), which I understand is the authoritative dataset for road safety in New Zealand.

Part 1: Data Input and Verification Standards Could you please provide:
A copy of the official data quality assurance framework, service level agreement, or memorandum of understanding currently in place between NZTA and the NZ Police. This document should outline the agreed-upon standards for the accuracy, completeness, timeliness, and reliability of the Traffic Crash Report (TCR) data that is supplied by NZ Police for inclusion in the CAS database.

A copy of the official training materials, manuals, or curriculum documents that are provided to NZ Police officers regarding the correct and consistent completion of TCRs to ensure the integrity of the data being fed into CAS.

Part 2: Management of Known Data Errors
Waka Kotahi's 2022 research report, "Alcohol-related crash trends" (Report 694), identified several significant, systemic errors within the CAS data from late 2018 onwards, including the "breath refused" and "blood pending" issues, leading the report to conclude that the data for this period is "unreliable."

Could you please provide:
A copy of the final-version internal risk assessment report or briefing note that details the discovery of these systemic errors, their root cause, and their impact on the overall reliability of the CAS database.

A copy of the official project plan, timeline, and budget that has been approved by Waka Kotahi senior leadership to correct these historical data errors and to prevent their recurrence.

Yours faithfully,

Lewis T

-------------------------------------------------------------------

This is an Official Information request made via the FYI website.

Please use this email address for all replies to this request:
[FOI #32419 email]

Is [NZTA request email] the wrong address for Official Information requests to New Zealand Transport Agency? If so, please contact us using this form:
https://fyi.org.nz/change_request/new?bo...

Disclaimer: This message and any reply that you make will be published on the internet. Our privacy and copyright policies:
https://fyi.org.nz/help/officers

If you find this service useful as an Official Information officer, please ask your web manager to link to us from your organisation's OIA or LGOIMA page.

-------------------------------------------------------------------

This message, together with any attachments, may contain information that is classified and/or subject to legal privilege. Any classification markings must be adhered to. If you are not the intended recipient, you must not peruse, disclose, disseminate, copy or use the message in any way. If you have received this message in error, please notify us immediately by return email and then destroy the original message. This communication may be accessed or retained by NZ Transport Agency Waka Kotahi for information assurance purposes.

hide quoted sections

Kia ora Lewis

Partially transferring the request you made under the Official Information Act 1982

Thank you for your email below requesting information under the Official Information Act 1982 (the Act).

The following information you have requested is more closely connected with the functions of New Zealand Police than with NZ Transport Agency Waka Kotahi:

A copy of the official training materials, manuals, or curriculum documents that are provided to NZ Police officers regarding the correct and consistent completion of TCRs to ensure the integrity of the data being fed into CAS.

Therefore, NZ Transport Agency is transferring this part of your request to New Zealand Police under section 14 of the Act.

The time limit for their response to you is 20 working days from 23 October 2025 so you can expect a response from New Zealand Police on or before 21 November 2025.

Ngā mihi

Ministerial Services
Te Waka Kōtuia | Engagement & Partnerships
NZ Transport Agency Waka Kotahi
Connect with us on Social Media

-----Original Message-----
From: Lewis T <[FOI #32419 email]>
Sent: Monday, 29 September 2025 10:55 pm
To: Official Correspondence <[email address]>
Subject: Official Information request - CAS Data Quality

[You don't often get email from [FOI #32419 email]. Learn why this is important at https://aka.ms/LearnAboutSenderIdentific... ]

Dear New Zealand Transport Agency,

Kia ora

As a member of the public with a keen interest in evidence-based policymaking, I am writing to better understand the governance and quality assurance frameworks that underpin the Crash Analysis System (CAS), which I understand is the authoritative dataset for road safety in New Zealand.

Part 1: Data Input and Verification Standards Could you please provide:
A copy of the official data quality assurance framework, service level agreement, or memorandum of understanding currently in place between NZTA and the NZ Police. This document should outline the agreed-upon standards for the accuracy, completeness, timeliness, and reliability of the Traffic Crash Report (TCR) data that is supplied by NZ Police for inclusion in the CAS database.

A copy of the official training materials, manuals, or curriculum documents that are provided to NZ Police officers regarding the correct and consistent completion of TCRs to ensure the integrity of the data being fed into CAS.

Part 2: Management of Known Data Errors
Waka Kotahi's 2022 research report, "Alcohol-related crash trends" (Report 694), identified several significant, systemic errors within the CAS data from late 2018 onwards, including the "breath refused" and "blood pending" issues, leading the report to conclude that the data for this period is "unreliable."

Could you please provide:
A copy of the final-version internal risk assessment report or briefing note that details the discovery of these systemic errors, their root cause, and their impact on the overall reliability of the CAS database.

A copy of the official project plan, timeline, and budget that has been approved by Waka Kotahi senior leadership to correct these historical data errors and to prevent their recurrence.

Yours faithfully,

Lewis T

-------------------------------------------------------------------

This is an Official Information request made via the FYI website.

Please use this email address for all replies to this request:
[FOI #32419 email]

Is [NZTA request email] the wrong address for Official Information requests to New Zealand Transport Agency? If so, please contact us using this form:
https://fyi.org.nz/change_request/new?bo...

Disclaimer: This message and any reply that you make will be published on the internet. Our privacy and copyright policies:
https://fyi.org.nz/help/officers

If you find this service useful as an Official Information officer, please ask your web manager to link to us from your organisation's OIA or LGOIMA page.

-------------------------------------------------------------------

This message, together with any attachments, may contain information that is classified and/or subject to legal privilege. Any classification markings must be adhered to. If you are not the intended recipient, you must not peruse, disclose, disseminate, copy or use the message in any way. If you have received this message in error, please notify us immediately by return email and then destroy the original message. This communication may be accessed or retained by NZ Transport Agency Waka Kotahi for information assurance purposes.

hide quoted sections

Kia ora Lewis

 

Please find attached the response to your request of 29 September 2025 for
information under the Official Information Act 1982.

 

Ngā mihi

 

Ministerial Services
Te Waka Kōtuia | Engagement & Partnerships
NZ Transport Agency Waka Kotahi

[1]Connect with us on Social Media

 

[2][IMG]

 

 

 

-----Original Message-----
From: Lewis T <[3][FOI #32419 email]>
Sent: Monday, 29 September 2025 10:55 pm
To: Official Correspondence <[4][email address]>
Subject: Official Information request - CAS Data Quality

 

[You don't often get email from
[5][FOI #32419 email]. Learn why this is
important at [6]https://aka.ms/LearnAboutSenderIdentific... ]

 

Dear New Zealand Transport Agency,

 

Kia ora

 

As a member of the public with a keen interest in evidence-based
policymaking, I am writing to better understand the governance and quality
assurance frameworks that underpin the Crash Analysis System (CAS), which
I understand is the authoritative dataset for road safety in New Zealand.

 

Part 1: Data Input and Verification Standards Could you please provide:

A copy of the official data quality assurance framework, service level
agreement, or memorandum of understanding currently in place between NZTA
and the NZ Police. This document should outline the agreed-upon standards
for the accuracy, completeness, timeliness, and reliability of the Traffic
Crash Report (TCR) data that is supplied by NZ Police for inclusion in the
CAS database.

 

A copy of the official training materials, manuals, or curriculum
documents that are provided to NZ Police officers regarding the correct
and consistent completion of TCRs to ensure the integrity of the data
being fed into CAS.

 

Part 2: Management of Known Data Errors

Waka Kotahi's 2022 research report, "Alcohol-related crash trends" (Report
694), identified several significant, systemic errors within the CAS data
from late 2018 onwards, including the "breath refused" and "blood pending"
issues, leading the report to conclude that the data for this period is
"unreliable."

 

Could you please provide:

A copy of the final-version internal risk assessment report or briefing
note that details the discovery of these systemic errors, their root
cause, and their impact on the overall reliability of the CAS database.

 

A copy of the official project plan, timeline, and budget that has been
approved by Waka Kotahi senior leadership to correct these historical data
errors and to prevent their recurrence.

 

Yours faithfully,

 

Lewis T

 

-------------------------------------------------------------------

 

This is an Official Information request made via the FYI website.

 

Please use this email address for all replies to this request:

[7][FOI #32419 email]

 

Is [8][NZTA request email] the wrong address for Official
Information requests to New Zealand Transport Agency? If so, please
contact us using this form:

[9]https://aus01.safelinks.protection.outlo...

 

Disclaimer: This message and any reply that you make will be published on
the internet. Our privacy and copyright policies:

[10]https://aus01.safelinks.protection.outlo...

 

If you find this service useful as an Official Information officer, please
ask your web manager to link to us from your organisation's OIA or LGOIMA
page.

 

 

-------------------------------------------------------------------

 

 

This message, together with any attachments, may contain information that
is classified and/or subject to legal privilege. Any classification
markings must be adhered to. If you are not the intended recipient, you
must not peruse, disclose, disseminate, copy or use the message in any
way. If you have received this message in error, please notify us
immediately by return email and then destroy the original message. This
communication may be accessed or retained by NZ Transport Agency Waka
Kotahi for information assurance purposes.

References

Visible links
1. https://www.nzta.govt.nz/contact-us/conn...
2. https://nzta.govt.nz/
3. mailto:[FOI #32419 email]
4. mailto:[email address]
5. mailto:[FOI #32419 email]
6. https://aka.ms/LearnAboutSenderIdentific...
7. mailto:[FOI #32419 email]
8. mailto:[NZTA request email]
9. https://fyi.org.nz/change_request/new?bo...
10. https://fyi.org.nz/help/officers

hide quoted sections

Tēnā koe Lewis,

I acknowledge receipt of your Official Information Act 1982 (OIA) request below.

Your reference number is IR-01-25-38979.

You can expect a response to your request on or before 21 November 2025 unless an extension is needed.

Ngā mihi

Jonelle|Advisor: Ministerial Services |(she/her)
Policy & Partnerships |Police National Headquarters |

-----Original Message-----
From: Official Correspondence <[email address]>
Sent: Thursday, 23 October 2025 3:37 pm
To: Lewis T <[FOI #32419 email]>
Subject: OIA-19770 NOTIFICATION OF PARTIAL TRANSFER

Kia ora Lewis

Partially transferring the request you made under the Official Information Act 1982

Thank you for your email below requesting information under the Official Information Act 1982 (the Act).

The following information you have requested is more closely connected with the functions of New Zealand Police than with NZ Transport Agency Waka Kotahi:

A copy of the official training materials, manuals, or curriculum documents that are provided to NZ Police officers regarding the correct and consistent completion of TCRs to ensure the integrity of the data being fed into CAS.

Therefore, NZ Transport Agency is transferring this part of your request to New Zealand Police under section 14 of the Act.

The time limit for their response to you is 20 working days from 23 October 2025 so you can expect a response from New Zealand Police on or before 21 November 2025.

Ngā mihi

Ministerial Services
Te Waka Kōtuia | Engagement & Partnerships NZ Transport Agency Waka Kotahi Connect with us on Social Media

-----Original Message-----
From: Lewis T <[FOI #32419 email]>
Sent: Monday, 29 September 2025 10:55 pm
To: Official Correspondence <[email address]>
Subject: Official Information request - CAS Data Quality

[You don't often get email from [FOI #32419 email]. Learn why this is important at https://aka.ms/LearnAboutSenderIdentific... ]

Dear New Zealand Transport Agency,

Kia ora

As a member of the public with a keen interest in evidence-based policymaking, I am writing to better understand the governance and quality assurance frameworks that underpin the Crash Analysis System (CAS), which I understand is the authoritative dataset for road safety in New Zealand.

Part 1: Data Input and Verification Standards Could you please provide:
A copy of the official data quality assurance framework, service level agreement, or memorandum of understanding currently in place between NZTA and the NZ Police. This document should outline the agreed-upon standards for the accuracy, completeness, timeliness, and reliability of the Traffic Crash Report (TCR) data that is supplied by NZ Police for inclusion in the CAS database.

A copy of the official training materials, manuals, or curriculum documents that are provided to NZ Police officers regarding the correct and consistent completion of TCRs to ensure the integrity of the data being fed into CAS.

Part 2: Management of Known Data Errors
Waka Kotahi's 2022 research report, "Alcohol-related crash trends" (Report 694), identified several significant, systemic errors within the CAS data from late 2018 onwards, including the "breath refused" and "blood pending" issues, leading the report to conclude that the data for this period is "unreliable."

Could you please provide:
A copy of the final-version internal risk assessment report or briefing note that details the discovery of these systemic errors, their root cause, and their impact on the overall reliability of the CAS database.

A copy of the official project plan, timeline, and budget that has been approved by Waka Kotahi senior leadership to correct these historical data errors and to prevent their recurrence.

Yours faithfully,

Lewis T

-------------------------------------------------------------------

This is an Official Information request made via the FYI website.

Please use this email address for all replies to this request:
[FOI #32419 email]

Is [NZTA request email] the wrong address for Official Information requests to New Zealand Transport Agency? If so, please contact us using this form:
https://fyi.org.nz/change_request/new?bo...

Disclaimer: This message and any reply that you make will be published on the internet. Our privacy and copyright policies:
https://fyi.org.nz/help/officers

If you find this service useful as an Official Information officer, please ask your web manager to link to us from your organisation's OIA or LGOIMA page.

-------------------------------------------------------------------

===============================================================

WARNING

The information contained in this email message is intended for the addressee only and may contain privileged information. It may also be subject to the provisions of section 50 of the Policing Act 2008, which creates an offence to have unlawful possession of Police property. If you are not the intended recipient of this message or have received this message in error, you must not peruse, use, distribute or copy this message or any of its contents. Also note, the views expressed in this message may not necessarily reflect those of the New Zealand Police. If you have received this message in error, please email or telephone the sender immediately

hide quoted sections

Kia ora

I refer to your request below. I have been asked to advise you that Police requires an extension of time in which to respond to your request, pursuant to section 15A(1)(b), consultations necessary to make a decision on the request are such that a proper response to the request cannot reasonably be made within the original time limit.

Police requires until 28 November 2025 to provide a substantive response to your request, however we are endeavouring to provide this to you as soon as possible.

You have the right, under section 28(3) of the OIA, to make a complaint to an Ombudsman about this extension. Information about how to make a complaint is available at http://www.ombudsman.parliament.nz/ or freephone 0800 802 602.

Ngā mihi,

Siena (she/her)
Advisor - Ministerial Services
Police National Headquarters

-----Original Message-----
From: Ministerial Services
Sent: Friday, 24 October 2025 11:45 am
To: '[FOI #32419 email]' <[FOI #32419 email]>
Subject: OIA Acknowledgement IR-01-25-38979

Tēnā koe Lewis,

I acknowledge receipt of your Official Information Act 1982 (OIA) request below.

Your reference number is IR-01-25-38979.

You can expect a response to your request on or before 21 November 2025 unless an extension is needed.

Ngā mihi

Jonelle|Advisor: Ministerial Services |(she/her)
Policy & Partnerships |Police National Headquarters |

-----Original Message-----
From: Official Correspondence <[email address]>
Sent: Thursday, 23 October 2025 3:37 pm
To: Lewis T <[FOI #32419 email]>
Subject: OIA-19770 NOTIFICATION OF PARTIAL TRANSFER

Kia ora Lewis

Partially transferring the request you made under the Official Information Act 1982

Thank you for your email below requesting information under the Official Information Act 1982 (the Act).

The following information you have requested is more closely connected with the functions of New Zealand Police than with NZ Transport Agency Waka Kotahi:

A copy of the official training materials, manuals, or curriculum documents that are provided to NZ Police officers regarding the correct and consistent completion of TCRs to ensure the integrity of the data being fed into CAS.

Therefore, NZ Transport Agency is transferring this part of your request to New Zealand Police under section 14 of the Act.

The time limit for their response to you is 20 working days from 23 October 2025 so you can expect a response from New Zealand Police on or before 21 November 2025.

Ngā mihi

Ministerial Services
Te Waka Kōtuia | Engagement & Partnerships NZ Transport Agency Waka Kotahi Connect with us on Social Media

-----Original Message-----
From: Lewis T <[FOI #32419 email]>
Sent: Monday, 29 September 2025 10:55 pm
To: Official Correspondence <[email address]>
Subject: Official Information request - CAS Data Quality

[You don't often get email from [FOI #32419 email]. Learn why this is important at https://aka.ms/LearnAboutSenderIdentific... ]

Dear New Zealand Transport Agency,

Kia ora

As a member of the public with a keen interest in evidence-based policymaking, I am writing to better understand the governance and quality assurance frameworks that underpin the Crash Analysis System (CAS), which I understand is the authoritative dataset for road safety in New Zealand.

Part 1: Data Input and Verification Standards Could you please provide:
A copy of the official data quality assurance framework, service level agreement, or memorandum of understanding currently in place between NZTA and the NZ Police. This document should outline the agreed-upon standards for the accuracy, completeness, timeliness, and reliability of the Traffic Crash Report (TCR) data that is supplied by NZ Police for inclusion in the CAS database.

A copy of the official training materials, manuals, or curriculum documents that are provided to NZ Police officers regarding the correct and consistent completion of TCRs to ensure the integrity of the data being fed into CAS.

Part 2: Management of Known Data Errors
Waka Kotahi's 2022 research report, "Alcohol-related crash trends" (Report 694), identified several significant, systemic errors within the CAS data from late 2018 onwards, including the "breath refused" and "blood pending" issues, leading the report to conclude that the data for this period is "unreliable."

Could you please provide:
A copy of the final-version internal risk assessment report or briefing note that details the discovery of these systemic errors, their root cause, and their impact on the overall reliability of the CAS database.

A copy of the official project plan, timeline, and budget that has been approved by Waka Kotahi senior leadership to correct these historical data errors and to prevent their recurrence.

Yours faithfully,

Lewis T

-------------------------------------------------------------------

This is an Official Information request made via the FYI website.

Please use this email address for all replies to this request:
[FOI #32419 email]

Is [NZTA request email] the wrong address for Official Information requests to New Zealand Transport Agency? If so, please contact us using this form:
https://fyi.org.nz/change_request/new?bo...

Disclaimer: This message and any reply that you make will be published on the internet. Our privacy and copyright policies:
https://fyi.org.nz/help/officers

If you find this service useful as an Official Information officer, please ask your web manager to link to us from your organisation's OIA or LGOIMA page.

-------------------------------------------------------------------

===============================================================

WARNING

The information contained in this email message is intended for the addressee only and may contain privileged information. It may also be subject to the provisions of section 50 of the Policing Act 2008, which creates an offence to have unlawful possession of Police property. If you are not the intended recipient of this message or have received this message in error, you must not peruse, use, distribute or copy this message or any of its contents. Also note, the views expressed in this message may not necessarily reflect those of the New Zealand Police. If you have received this message in error, please email or telephone the sender immediately

hide quoted sections

Tēnā koe Lewis

 

Please find attached the response relating to your Official Information
Act request, received by Police on 23 October 2025.

 

Please accept our apologies for the delay in providing you with a response
to your request.

 

Ngā mihi

Lisa

Ministerial Services

Police National Headquarters

 

===============================================================

WARNING

The information contained in this email message is intended for the
addressee only and may contain privileged information. It may also be
subject to the provisions of section 50 of the Policing Act 2008, which
creates an offence to have unlawful possession of Police property. If you
are not the intended recipient of this message or have received this
message in error, you must not peruse, use, distribute or copy this
message or any of its contents. Also note, the views expressed in this
message may not necessarily reflect those of the New Zealand Police. If
you have received this message in error, please email or telephone the
sender immediately