The fact that street lighting is exclusive and unrivaled makes it a public good. Since everyone can benefit from street lighting, privatizing it would turn it into a private good, which is not possible.
The visibility and safety of pedestrians are both enhanced by street lighting. Even after the trees get huge and tall, sidewalk illumination on roadways with lots of trees (low lights) illuminates the street. By enabling cars and pedestrians to see one another, street lighting enhances safety.
Street lights of poor quality need frequent maintenance and replacement. This has an impact on pedestrian safety in addition to raising the cost of public investment in urban construction.
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