The ADAS Functionality and Integrity Act requires the National Highway Traffic Safety Administration (NHTSA) to create federal guidelines ensuring that advanced driver assistance systems in cars continue working properly after modifications like changing tire size, ride height, or suspension. The bill affects car manufacturers, repair shops, aftermarket businesses, and vehicle owners, particularly those who customize their vehicles. NHTSA has 24 months to develop these guidelines based on empirical testing data, and manufacturers must provide tolerance information to owners and regulators within 30 days of releasing new vehicles. Before developing the full guidelines, NHTSA must complete a feasibility study within 12 months to assess costs and safety needs. Manufacturers that fail to meet the guidelines face civil penalties under existing federal motor vehicle law. The requirements apply to cars from the 2028 model year onward.
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