The Rimutaka Hill Rd has been closed due to a number of slips.
NZ Transport Agency spokesman Anthony Frith said that it often happens after a period of wet weather that the hill between Wairarapa and Wellington gets saturated, causing slips.
"There's a number of slips been identified - there's nothing dramatic closing the road but the cumulative effect is making driving a bit tenuous."
Frith said contractors were working to clear the slips as soon as possible and would keep drivers informed via Twitter and the website, but could not say how long it would be closed for yet.
- The Dominion Post