The purpose of this legislation, known as the ADAS Functionality and Integrity Act, is to ensure that advanced driver assistance systems (ADAS) in passenger vehicles remain functional and safe after modifications or customizations. It aims to establish clear guidelines for how these systems should be calibrated and what tolerances are acceptable when changes are made to a vehicle. Key provisions of the Act require the National Highway Traffic Safety Administration (NHTSA) to develop and publish guidelines within two years of the law being enacted.