Economic growth may hit a bit of a pot hole in the second quarter if truck movements are anything to go by.
The ANZ Bank's Truckometer index gives an immediate and forward-looking indicator about the economy.
The heavy traffic index dipped a seasonally adjusted 1.7 percent last month, after a bigger fall in April, while the light traffic index - which leads the economy by six months - fell 1.3 percent.
ANZ senior economist Sharon Zollner said there's some uncertainty ahead for the New Zealand economy.
"If you take it at face-value, the fall in April and May is not a great start to Q2 - which is of course the three months April, May and June...we may well see a big bounce-back in the June month which would save the quarter," she said.