A review has been launched into how the government's roading agency monitors emails it sends to people.
Internal affairs minister Peter Dunne prompted the review.
He said concerns were raised with him over emails sent about a roading project in his Ohariu electorate.
Mr Dunne says it appears NZTA could potentially see what recipients do with the emails.
Source: 1 NEWS
He passed on his concerns to the Privacy Commissioner and the Transport Minister.
And minister Simon Bridges says the transport agency's now conducting a review of privacy issues.
But, in a letter to Mr Dunne, Mr Bridges has also said email monitoring was not uncommon amongst government agencies.
A spokeswoman for NZTA said it used Campaign Monitor - a communication tool to "manage and distribute news about state highway projects".
She said: "Members of the public can subscribe to project updates through the NZ Transport Agency's website, using their name and email address. They can unsubscribe at any time."
"Campaign Monitor and other similar tools are used by other government agencies to keep the public informed."
She confirmed the independent privacy "to ensure that use of this tool does not pose a risk to privacy or security of information."
And she added: "We take our obligations under the Privacy Act seriously and would cooperate fully with any investigation by the Privacy Commissioner."