Land Transport Act 1998, ss 22AF, 96(1AA)
If you’re stopped for breaching a cruising bylaw, the police can give you a warning notice, which they’ll attach to your vehicle (this will be either as well as, or instead of, giving you an infringement notice for cruising). This means that if they stop you again for breaching a cruising bylaw any time within the next 90 days (three months), your vehicle will be impounded for 28 days (see: “Losing your vehicle: Impounding and confiscation”).
Land Transport Act 1998, s 52(8)
If you remove or cover up the warning notice, you can be fined up to $10,000.