UPDATE 12.12pm: State Highway 36 is now closed near Rotorua between Waiteti Road and Leonard Road due to a serious crash.

"Allow extra time for delays on short detour via local roads," says a Waka Kotahi spokesperson."

"Not suitable for heavy vehicles."

The crash was reported at around 11am, according to police.

"One person is in a critical condition," says a police spokesperson.

"Dalbeth Road and section of SH36 from Leonard Road to Waiteti Road will be closed for several hours.

"Motorists are advised to avoid the area and take alternative routes.

"The Serious Crash Unit has been notified.

"Enquiries into the circumstances of the crash are ongoing."

EARLIER 11.31am: A serious crash is being reported to emergency services on State Highway 36, near Dalbeth Road.

"Expect delays," says a Waka Kotahi spokesperson.

"A road closure may be required.

"An update will be provided as soon as more information is available."

According to Google Maps, SH36 traffic is moving slowly in the area.

SunLive has approached police for comment.