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EPA is proposing changes to the test procedures used for heavy-duty engines and vehicles to demonstrate compliance with emission standards. These changes improve accuracy and reduce testing burden. EPA is also proposing other amendments related to light-duty vehicles, heavy-duty vehicles, highway motorcycles, locomotives, marine engines, and other non-road engines and vehicles. These other amendments would add compliance flexibility, harmonize with other requirements, add clarity, correct various errors, and streamline the regulations. Given the nature of the proposed changes, they would have neither significant environmental impacts nor significant economic impacts for any sector.