棋子矩形原点(左上角)的左方向坐标。
Left coordinate of checker rectangle origin (upper-left corner).
转左方向的黄灯之后,会有转左的红灯亮起。
After the yellow light, a red light appears for left-turning vehicles only.
室内机都以水平向左方向的安装状态出厂,如右下图所示。
All units are factory-built for horizontal-left installation showed as the right-down figure.
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