Why are street lights on all night?

I found that the street lights are actually on all night. But in the middle of the night, there are barely any cars or passengers. Doesn’t it waste the energy?
  • Ensuring safety on the roads: Even at night, there are still some cars on the road, so sufficient lighting is necessary.
  • Ensuring the safety of citizens: Some citizens may go out at night; if the street is dark, they cannot notice if there is any danger on their way.
  • Providing light to workers: Some workers need to work at night, such as the patrol officers. They need light to finish their tasks.

More reading: How Much Do Street Lights Cost?

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