A HGV driver who killed a fellow lorry driver in a crash after falling asleep at the wheel has been jailed for three-and-a-half years.

David MacDonald, 25, failed to take sufficient rest before the collision on the A9 with a vehicle being driven by 57-year-old Gordon Cooper.

MacDonald was driving north in a tanker between Dunkeld and Ballinluig on December 23, 2010, when it began to drift across to the opposite side of the road before smashing into the other vehicle.

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Two teenage friends of MacDonald were accompanying him on the trip and one of them screamed at him moments before the fatal collision.

A judge told MacDonald at the High Court in Edinburgh that the victim was a family man who left a widow and two sons.

Lord Bracadale said he was conscious no sentence he imposed could bring back Mr Cooper or begin to compensate for his loss. The judge said: "The sentence cannot and is not intended to measure the value of the life of Mr Cooper."

The judge said he accepted that MacDonald had shown remorse and was carrying a considerable burden over what happened.

The judge told him he would have faced a jail sentence of four years and nine months but for his guilty plea. He also banned MacDonald from driving for seven years.