Descriptors | Parapets, Crash barriers, Protective barriers, Barriers, Guard rails, Bridges, Retaining walls, Road safety, Transportation safety, Metals, Length, Height, Thickness, Designations, Design, Design calculations, Durability, Joints, Anchorages, Plinths, End, Steels, Aluminium alloys, Installation, Testing conditions, Type testing, Marking, Structural design, Impact testing, Deflection tests, Test equipment, Grades (quality), Plastic analysis |