Whistle boards must be provided at an adequate distance in rear of all level crossing gates on both side? A. 400 meters B. 500 meters C. 600 meters D. 800 meters

The correct answer is: B. 500 meters

Whistle boards are devices that are used to warn motorists of the approach of a train at a level crossing. They are typically made of metal or plastic and are mounted on poles or other structures near the crossing. When a train approaches, the whistle board will emit a loud whistle sound to alert motorists to the danger.

The distance at which whistle boards must be placed in rear of all level crossing gates on both side is 500 meters. This distance is specified in the Indian Railway Safety Rules, 1989.

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