This rulemaking would update the accessibility guidelines for buses, over-the-road buses, and vans covered by the Americans with Disabilities Act (ADA). The accessibility guidelines for other transportation vehicles covered by the ADA, including vehicles operated in fixed guideway systems (e.g., rapid rail, light rail, commuter rail, high speed rail, and intercity rail) would be updated in a future rulemaking (RIN 3014-AA42). The guidelines ensure that transportation vehicles covered by the ADA are readily accessible to and usable by individuals with disabilities. The U.S. Department of Transportation (DOT) has issued enforceable standards (49 CFR part 37) that apply to the acquisition of new, used, and remanufactured transportation vehicles, and the remanufacture of existing transportation vehicles covered by the ADA. DOT is expected to update its standards in a separate rulemaking to be consistent with the updated guidelines.