I. Highway Corrugated Beam Steel Guardrail (National Standard GR Series, Most Commonly Used)

1) Crash Resistance Levels (Roadside/Median Strip)

B Grade: County Roads, Rural Roads; Plate Thickness 3.0mm

A Grade: National Highways, Provincial Highways; Plate Thickness 4.0mm

SB Grade: Reinforced (Sharp Curves, Waterfront); Three Waves

SA Grade: Reinforced Highway Side

SS Grade: Extra-Large Bridges, Tunnel Entrances (Highest Grade)

2) Commonly Used Two-Wave (Double Wave) Models

GR-B-4E: B Grade, Post Spacing 4m, Driven into Soil

GR-A-4E: A Grade, Post Spacing 4m, Driven into Soil (Most Commonly Used)

GR-A-4C: A Grade, 4m Spacing, Concrete Foundation

GR-Am-2E: Median Strip, A Reinforced, 2m Spacing

Specifications (Double Wave): 4320×310×85mm; Thickness 2.5/3.0/4.0mm posts: φ114×4.5mm (Grade B), φ140×4.5mm (Grade A)

3) Commonly Used Three-Wave (High-Strength) Models

GR-SB-2E: SB grade reinforced, 2m spacing, driven into the soil

GR-SA-2E: SA grade, 2m spacing

GR-SS-2E: SS grade, 2m spacing

Specifications: 4320×506×85mm; 4.0mm thick posts: 130×130×6mm square posts or φ140×4.5mm