As an AI language model, I don't know the exact situation you are referring to but setback can have various purposes depending on the context. Here are some possible purposes of a setback:
1. Safety and disaster prevention: A setback in building construction is mandated to ensure that in case a building catches fire or collapses, it will not affect adjacent properties or public areas.
2. Aesthetic value: A setback can be required to enhance the look of a landscape or streetscape by creating a more pleasant and visually appealing environment.
3. Access and mobility: Setbacks in road construction are used to provide space for pedestrians or cyclists, to create safe turning spaces for vehicles, or to allow for public transportation vehicles to stop and pick up passengers.
4. Privacy and noise reduction: Setbacks can help prevent close proximity between buildings, which can reduce noise and provide a buffer zone between different types of uses, such as residential and commercial.
Overall, the purpose of a setback is to provide a balance between meeting the needs of development and preserving the quality of life and safety of communities.
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