W –Beam /Threi Beam Metal Crash Barrier single side/Double Side Guard rail comprising of 3 mm cold rolled section having minimum yield strength 2400 kg /sqcm having width of 312 /510 mm and depth of corrugation as 83 mm with hot dip galvanized of zinc coating@ 550 g/sqm having total length 4.318mm. The steel post and the spacer are 75mm x 150mm and 5mm thick segments and are spaced 2meter center-to-center as per MORTH specification