Three-wheeled vehicles designed to drive on the footpath are part of a New Zealand Post initiative being rolled out across the country to keep up with its "growing" parcel business.
New Plymouth will be the first city to test the new eco-friendly vehicles, which were designed to deliver both parcels and mail simultaneously to residential addresses and businesses.
As online shopping orders continued to boost parcel numbers, the pilot run in New Plymouth would be a test for the new combined system, New Zealand Post said.
Ashley Smout, delivery officer for New Zealand Post, said the new system should help "avoid the disappointment of a missed delivery".
"Customers are buying goods online in numbers we've never seen before and our parcels business is growing.