Why Four-Quadrant Gates?
To limit motorists violation of two-quadrant gate warning systems, the 4QG Crossing System is utilized to provide a full closure to the crossing. Typical two-quadrant gate systems utilize gates to prevent approaching vehicles from entering the crossing (entrance gates). The problem arises when vehicles drive around the lowering or lowered entrance gates either because they do not see the train or feel that they can beat the train to the crossing. The Federal Railroad Administration (FRA) has reviewed studies from across the country and analyzed the effectiveness of various types of grade crossing signal improvements. According to the FRA, four-quadrant gates have an effectiveness rating higher than any other type of active grade crossing warning device improvement. Many cities desiring quiet zones have turned to four-quadrant gates as the most effective means of silencing train horns through their respective communities.
