Go Bus is spending $2.2 million on five new buses for Hawke's Bay.
Managing director Calum Haslop said its renewed nine-year contract with the Hawke's Bay Regional Council, starting August, required larger vehicles on some routes and more frequency on others.
Express buses between Napier and Hastings will be replaced with "modern, super-low-floor mid-size urban buses".
On route 12, between Napier and Hastings via Hawke's Bay Hospital, EIT, Greenmeadows and Marewa, there would be larger-capacity buses.
The company, owned by Tainui Group Holdings and Ngai Tahu Holdings Corporation, ordered the buses to be built by Christchurch-based Designline Bus Pacific, adding to Go Bus' Hawke's Bay urban fleet of 21.