The ADA dictates that the running slope of an accessible pathway must not exceed 5.00% (a 1:20 ratio), unless constructed as a formal ramp, which is allowed a maximum slope of 8.33% (a 1:12 ratio). When municipal sidewalks follow existing natural street grades, they must adhere as closely to these thresholds as possible. NYC contractors must take careful elevation readings during excavation and grading to ensure the final paved surface remains within legal running slope tolerances.
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