Horizons Regional Council is urging people who use their buses to keep records of their trips.
The council's transport manager, Rhona Hewitt, says Horizons is committed to stamping out Covid-19 in our communities.
"One action we can take is assisting our health services with contact tracing.
"During the Covid-19 lockdown, public transport will be focused on allowing essential workers to travel between their homes and workplaces; and to allow the public access to food and medical care for those who do not have access to private vehicles.
"Each time these people use the bus, it's important that they record their trip details and contact information. This is so we can provide this information to the Ministry of Health if it is requested.