A jack-knifed lorry causes a tailback on the A1 motorway leading to an accident between two lorries, leaving a man dead and forcing the motorway cops to shut the road while they investigate. The motorway cops are involved in a high speed chase but a breakdown in radio communications leaves them playing catch up. A lorry driver diverted from the A1 causes major problems when he crashes into a bridge after underestimating the size of his load.