• Source: Guard rail (disambiguation)

A guard rail is a protective boundary feature.
Guard rail or guardrail may also refer to:

Railroad guard rails (otherwise known as check rails), installed parallel to trackbed rails, for railway safety
RC-12 Guardrail, a U.S. Army intelligence-gathering aircraft based on the C-12 Huron
Roof edge protection, rails installed on roofs to protect construction and roofing workers
Traffic barrier, installed on roadways for automobile safety

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