Free public transport is what Qiulae Wong (The Opportunity Party leader) said in the interview below.
https://youtube.com/watch?v=1b9PP7FZL1E
I guess it makes sense since the public already subsidises roughly 90% of the entire network?
Edit: Small correction. TOP says free public transport. What Labour announced is $20 cap. Not quite the same.
According to their website, https://www.opportunity.org.nz/free_public_transport