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What is the 'Minus green signal'?

Do you know the signal “minus green signal”? A dear child has many names, as they say. This signal, the “minus green signal”, has also been known by two other names: the mirror signal and the repeat signal.

So what does "Minus green signal" mean and where is it found in traffic?

It is a light signal consisting of the red and amber lights only; the green light is either absent or marked with a white cross. It is used only at traffic lights and applies exclusively to left turns.

The signal is installed to improve safety and make it easier for left-turning drivers to leave the junction safely. It is intended for drivers who are waiting in the middle of the junction to turn left when the lights for oncoming traffic change from green to amber and then to red.

When there is no light illuminated in this signal, oncoming traffic has a green light.

The “minus green signal” is not always easy to spot. Look for it on the far side of the junction, positioned on the corner between the oncoming traffic and the road you intend to turn into. If the signal has a white cross where the green light would normally be in a standard red-amber-green signal, it is easier to recognise.

Be sure to look out for it, because when the amber light in this signal illuminates, oncoming traffic must stop. At that point, you should ensure there is no oncoming traffic or other road users crossing, and then complete your left turn when it is safe to do so.
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