What is the purpose of cut-off street lights?

I learned that some of the street lights are cut-off types. Why do they make them cut-off?

Cut-off street lights control the direction of light. The light in the horizontal direction is limited, so there won’t be any glare or light pollution. Also, because most of the light can be cast on the roads, cut-off street lights can increase the brightness and illumination uniformity and save energy. In some cities, street lights on the main roads must be cut off to ensure the safety of drivers.

More reading: Standards about Street Lighting

What Others Are Asking

Do LED street lights save money?

LED street lights are more expensive than the other lights. Will the total costs of the LED street lights be lower? How do they make it?

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