The economy is continuing to truck along nicely, but overseas factors could have an impact down the road.
ANZ Bank's Truckometer measures the traffic flow on certain roads to provide a snapshot of how the economy is doing, in terms of production and momentum.
The heavy traffic index, which paints a more immediate picture of the economy's health, has fallen a seasonally-adjusted 0.4 percent in March, while the light traffic index, which gives a six month lead on the economy, is flat.
But both indices have made overall gains in first quarter.
ANZ senior economist Sharon Zöllner said the economy should have plenty of momentum in the next six months, but there are risks.
"Our two largest trading partners are China and Australia, both of those economies are slowing quite markedly at the moment and we are seeing our commodity prices fall," she said.
"We are a small trading nation reliant on selling stuff to the rest of the world, so we can't just truck-on regardless of what happens overseas, so we are watching developments over there with interest," she said.