Why on the narrowest street in Prague installed a traffic light?

Why on the narrowest street in Prague installed a traffic light?

In Prague, there is a pedestrian street called Devil winery, where you can see a real working lights. The question is - why is it needed if the cars on this street there? The answer is simple - in order to avoid a collision of pedestrians. The fact that this is the narrowest street in the Czech capital, the width of which reaches only seventy centimeters and if two people met her, they just simply do not disperse, and traffic helps avoid such situations. One unknown - whether the violators are fined?

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