B. Structural design drawings of Class A, SB, SA, SS corrugated guardrails and concrete anti-collision guardrails, the latest standards and specifications, including median guardrails, roadside guardrails, and four types of corrugated guardrails at each level. There are four types of corrugated guardrails for roadside earthwork normal section, roadside stonework section, roadside small bridges, channels, and open culvert sections