... large-scale outdoor events such as concerts,sports events,ect.5.Applicabel for the safety construction of highways,expressways and airport ... frame)352551,385-3,630mm2,220-4,950mm2,220-5,770mm2,750mm2,180-5,600mm3,000-6,100mm..1,060X730X1,6701,160X830X1 ...