guardrail

(gärdrāl′)

noun

  1. a railing that serves as a protective barrier, as on a staircase or alongside a highway
  2. ☆ an extra rail alongside the main rail of a railroad at a crossing, etc., as to keep the cars on the track

See guardrail in American Heritage Dictionary 4

noun
A protective railing, as on a staircase or along a highway.

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guardrail

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