Part of Lake Rd in Rotorua had to be closed overnight due to steam from a "rogue" geothermal bore.
The city-bound lane of Lake Rd was blocked off, opposite Kuirau Park, but is now open.
Traffic was diverted down Tarewa Rd this morning.
Rotorua District Council geothermal general inspector Peter Brownbridge said a bore on a private Lake Rd property across the road from Kuirau Park blew a valve sending clouds of steam across parts of the road.