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. Также, 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.

Больше чтения: Стандарты уличного освещения

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What are the different types of street lights?

I have heard about LED street lights, Уличные фонари HPS, and high pressure mercury street lights. And then I found that the poles also have different types. How many types of street lights are there?

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