The latest data on truck movements suggests the New Zealand economy could be at full throttle and may ease back this year.
The ANZ Bank's monthly truckometer index gives an immediate and forward-looking indicator about the economy.
It was relatively unchanged last month when compared to November.
ANZ senior economist Sharon Zollner said the economy was starting to hit some limits especially with labour shortages, debt and availability of credit.
"It could be that we are approaching the peak of the economic cycle, in growth terms.
"This does not mean something nasty is around the corner - though we are closely watching global risks - however, the economy is at somewhat of a cross roads," she said.