A major state highway is closed hours after a crash which injured a man and his dog.

The man in his 60s was airlifted to hospital while his dog is getting veterinary treatment for a suspected broken leg.

State Highway 2 remains closed after a car, which was towing a trailer, and another vehicle collided near Maramarua, at the intersection of the highway and Kopuku Rd, just before 2.30pm today.

Traffic is being diverted down the old state highway.

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One car and its trailer flipped while another vehicle was also involved, a police spokesman said.

A man was airlifted in the Waikato Westpac Rescue Helicopter to Waikato Hospital in a critical condition with head and arm injuries.

Emergency services at the scene of a crash on SH2 which left a man and his dog injured. Photo/Kirsty Wynn
Emergency services at the scene of a crash on SH2 which left a man and his dog injured. Photo/Kirsty Wynn

Another man was seen walking around the crash scene. He is in a serious condition.