in advance of a signal

基本解释

A sort of bus priority measure applied in signal intersections is set out, where bus advance area and pre signals are installed.
提出了在信号交叉口入口处设置一段特殊的公交专用车道——公交专用候驶区，并设车道信号灯的方法。
When a vehicle needs to change to the left lane, the driver should turn on the left-turn signal in advance and enter the left lane provided he does not obstruct the normal running of other vehicles.
驾驶车辆向左变更车道时，应提前开启左转向灯，在不影响其他车辆正常行驶的前提下，驶入左侧车道。
At first the filter based on mathematical morphology is applied to dispose the disturbance signal in advance. A multiple structuring element complex filter is created to restrain many kinds of noise.
首先利用数学形态学对扰动波形进行预处理，再使用分形技术检测电能质量扰动，最后用模式识别确定扰动类型。