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Grade Crossing Signals are the electronic warning devices for road vehicles at railroad grade crossings. The basic signal consists of flashing red lights, a crossbuck and a bell, attached to a mast. At most crossings, the signals will activate about 30 seconds before the train arrives. At crossings where trains travel at or more, there will be a gate added to the signal. The gates will be fully lowered 15 to 20 seconds before the train arrives. The gates will rise or the signals will shut off once the end of the train clears the island circuit. The time interval may be controlled by a grade crossing predictor, an electronic device which is connected to the rails of a railroad track, and activates the crossing's warning devices (lights, bells, gates, etc.) at a consistent interval prior to the arrival of a train at a grade crossing.〔(Marketing brochure by Westinghouse Rail Systems ) (archive)〕 Crossbucks also may have legends saying, for example: "RAIL ROAD CROSSING" (United States), "RAIL WAY CROSSING" (Australia), "PELIGRO FERROCARRIL" (Latin America), or wordless (Canada). Many states in the US are now requiring the use of this type of equipment at all newly constructed grade crossings. == History == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「grade crossing signals」の詳細全文を読む スポンサード リンク
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