An 83-year-old Queensland man has died after being hit by a B-double truck on the Hume Highway near Yass, in southern New South Wales.

Police said at 10.45am (AEDT) officers were called to Manton Ridge, approximately 10 kilometres from Yass, after reports a truck had crashed into a pedestrian.

They said it was believed two vehicles travelling north were stopped in the northbound outer lane, and the man was standing in the lane talking to driver of the other vehicle when he was hit.

He died at the scene.

The driver of the truck and two other people at the scene were not injured, but were taken to Yass Base Hospital suffering shock.

Police said the truck driver also underwent mandatory blood and urine testing at the hospital.

Officers diverted northbound motorists onto the Barton Highway, just north of Canberra, for several hours.

The road is now clear.