On the M1, police receive reports of a lorry drifting acrossbusy lanes. As officers get on its tail, the 40-ton vehicleswerves out of control, almost smashing into a queue oftraffic on a slip road. A HGV mysteriously loses control on adual carriageway and veers off the road, crashing head-firstinto a ditch. On the M1, a lorry pile-up brings officersracing to the scene.
