这些是标识灯的设置。
许多车在速度表上有“换挡指示灯”或标识，提示您什么时候应该换挡，别让引擎转速过高。
Many cars have a "shift Light" or indications on the speedometer that will tell you when you need to shift so you don't rev the engine too fast.
他还有一项学校路口标识的专例（兼具交通灯和蜂鸣器）。
He has a patent pending on a new school-crossing sign (it boasts lights and a buzzer).
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