If the system detects an obstacle that is likely to cause a crash, it warns the driver via an alarm, a flashing light, and then a tactile or "haptic" warning which tightens the driver's seatbelt.

如果该系统监测到前面有可能引发碰撞的障碍物，它就会通过警报器、闪烁灯以及可感触的(tactile or haptic)的警告——收紧驾驶员的安全带——向驾驶员发出警告。

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Warning light comes on when braking (both system).

制动时（双管路系统）警示灯亮。

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If bright light keeps the red color from appearing, the material's warning system will be useless.

如果强光抑制红色显示，那么这种材料的预警体系就将失效。

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It said it wanted a "traffic light" warning system for drugs - with green for those safe to take and drive, amber for caution and red signalling severe adverse effects which would dangerously impair driving.

BBC: You are in: UK

Last week a report from the Commons Education Select Committee issued a "red light" warning to the government, urging it to slow down and rethink its proposed changes to GCSEs and the exam system.

BBC: Planned switch from GCSEs to Baccalaureate in England 'abandoned' - BBC News