State Highway One at Poroutawhao, near Levin, is closed in both directions after a two-car crash on Friday afternoon.
Police said the two-car crash occurred about 3.25pm and two people have serious injuries while one person has moderate injuries.
The road is currently closed in both directions and traffic control is being put in place.
Fire and Emergency NZ told 1News they were also responding to the accident which left two cars in flames.
There’s no reports of anyone trapped in either vehicle. Two fire crews responded from Foxton and Waitarere.
NZ Transport Agency is warning travellers to take extra care and expect delays.