Lyttelton Tunnel
Markus Alexander made this Official Information request to New Zealand Transport Agency
Currently waiting for a response from New Zealand Transport Agency, they must respond promptly and normally no later than (details and exceptions).
From: Markus Alexander
Dear New Zealand Transport Agency,
It is my understanding that the Lyttelton Tunnel has a transverse ventilation system supplying fresh air into the tunnel at regular intervals along the tunnel. In a previous request from 2018 it was stated the air quality including carbon dioxide, nitrogen oxide, air flow and visibility was monitored.
How are these gases and the air flow monitored? What equipment is used?
How many primary and backup systems are in place to ensure these levels are accurately monitored?
What are the acceptable levels for each gas and acceptable air flow within the Lyttelton Tunnel?
What is the procedure for when the fresh air ventilation fan is shut down for routine maintenance and tunnel cleaning?
What is the maximum time the ventilation fan can be shut down for while still allowing cars or workers in the tunnel?
Yours faithfully,
Markus A
From: Official Correspondence
New Zealand Transport Agency
Kia ora Markus
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
8 August 2025.
If you would like to discuss your request with NZ Transport Agency, please
contact us by email at [1][NZTA request email].
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