Three motor vehicle crashes in the Tasman region kept emergency services busy today.

The Nelson Marlborough Rescue Helicopter attended the three crashes to transport those injured to Nelson Hospital.

In the first incident, at about 7.30am, a 39-year-old Tongan orchard worker was injured in a collision between a car and tractor on Main Rd, Riwaka.

The man was briefly pinned under the tractor by his leg, but was rescued and stabilised at the scene by emergency personnel.

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He was taken to Nelson Hospital with lower leg injuries.

At 11am the Nelson Marlborough Rescue Helicopter responded to a crash near Belgrove, where a 65-year-old Paeroa man had received head injuries after his van rolled on a bend.

In the third crash at 1.15pm a motorcycle left the road at Dovedale, crashed through a barrier and rolled down a bank.

The pillion passenger, a 24-year-old Wakefield man, suffered arm, neck and abdominal injuries in the crash.

He was assessed and treated by the Nelson Marlborough Rescue Helicopter intensive care paramedic before being flown in a serious condition to Nelson Hospital for further treatment.