General view of lorry coming round bend on wet surface. Lorry goes into a skid as the trailer jack-knifes. GV. Police officials watching. GV. Another lorry coming round bend, it goes into skid and camera pans with it. CU. Police officials. CU. Policeman looking at device which is lying on ground. CU. The device which is fitted into lorries. GV. Police and press around lorry which is fitted with anti-jack-knife device. CU. Police looking underneath lorry. SV. Man on top of trailer, Mr Hope, showing device which is fitted into the trailer. Pan down to show the device in the trailer. CU. Police looking, pan across to show man pointing to device on trailer. GV. Lorry coming round bend using anti-jack-knife device. Lorry stops without skidding. CU. Policeman looking. GV. Another lorry coming round using anti-jack-knife device. Zoom into lorry as it stops without skidding.