One person has suffered serious injuries after crashing a vehicle towing an empty horse float on State Highway 5 near Iwitahi.
The vehicle crashed into a bank around 1.30pm and emergency services have closed one lane of the highway.
NZTA says a stop/go system is in place with motorists travelling between Taupō and Napier asked to slow down and expect delays.
North of Auckland, highway traffic between Wellsford and Warkworth has eased following a crash earlier this afternoon.