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It is estimated that 35 percent of fatallity injured occupants of heavy goods vehicles might have lived if they had worn a lap and diagonal seat belt, the main benefit being prevention of ejection. A further 12 percent might also have lived if, as well as wearing a seat belt, the cab roof and supports had been strong enough to prevent severe crushing during over turning. As regards road users other than HGV occupants, it is estimated that, provided seat belts were worn, front under-run guards would have been of benefit to 10 percent of all occupants killed in cars and light goods vehicles in accidents involving heavy goods vehicle and rear under-run guards of benefit to an estimated 5 percent of fatally injured occupants. Lightweight guards fitted to the sides of HGVs could possibly prevent fatal injuries to an estimated 15 percent of the pedal cyclists, motocyclists and pedestrians killed by the heavy goods vehicles, mainly by preventing them from being run over