Evaluation of Curb Ramp Compliance: Review of Tools, Methods, and Time to Develop Error Tolerances
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2024-02-01
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Edition:Final Report
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Abstract:Americans with Disabilities Act (ADA) compliance is critical to ODOT’s mission to provide a safe and reliable multimodal transportation system by allowing equal access to infrastructure. Several challenges have resulted in difficulty in assessing compliance including inherent device errors, differences in measurement methods by inspectors, lack of consideration of flatness, settlement of ramps, lack of tolerances for construction processes and post-construction field settlement. In the absence of accepted construction tolerances, public agencies reject curb ramps when any measurement reading is greater than the allowed maximum slopes or where the slope readings themselves are inconsistent without acknowledging the inherent lack of precision with tools, variability of constructed surfaces, or understanding the error ranges of the measurement device. This research systematically evaluates the methods and tools used in the inspection process to achieve successful ADA compliance. To this end, the research investigates alternative technologies, determining the precision and repeatability of tools, identifying combinations of tools and methods, developing a flatness index, and providing an industry tolerance that considers these the cumulative potential effects on slope measurement.
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