What main aspect should sidewalk design prioritize for improved user safety?

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Prioritizing even surfaces and safe gradients in sidewalk design is crucial for improving user safety, particularly for pedestrians, including those with disabilities. Uneven surfaces can lead to trips and falls, posing a risk to all users, especially the elderly or those with mobility challenges. Safe gradients are also important to ensure that sidewalks remain accessible and navigable; steep inclines can be difficult for people using wheelchairs or strollers, while improper drainage can create hazardous puddles or ice.

While visibility during the night is important to help users navigate safely, it does not directly impact physical stability and accessibility in the way that even surfaces and safe gradients do. Aesthetic landscaping can enhance the appeal of a sidewalk but does not focus on the functional aspect of user safety. Similarly, durability of materials contributes to the longevity of the sidewalk but does not directly address the immediate safety concerns associated with uneven walking surfaces or abrupt changes in slope. Therefore, the emphasis on creating even surfaces and safe gradients directly contributes to a safer walking environment for everyone.