Committee on Technical Barriers to Trade - Notification - United States - Heavy-duty engines and vehicles


The following notification is being circulated in accordance with Article 10.6




If applicable, name of local government involved (Article 3.2 and 7.2):


Agency responsible:

National Highway Traffic Safety Administration (NHTSA), Department of Transportation (DOT) [1948]

Name and address (including telephone and fax numbers, email and website addresses, if available) of agency or authority designated to handle comments regarding the notification shall be indicated if different from above:

Please submit comments to: USA WTO TBT Enquiry Point, Email:


Notified under Article 2.9.2 [X], 2.10.1 [ ], 5.6.2 [X], 5.7.1 [ ], 3.2 [ ], 7.2 [ ], other:


Products covered (HS or CCCN where applicable, otherwise national tariff heading. ICS numbers may be provided in addition, where applicable): Heavy-duty engine and vehicle fuel efficiency; Spark-ignition reciprocating or rotary internal combustion piston engines. (HS code(s): 8407); Compression-ignition internal combustion piston engines (diesel or semi-diesel engines). (HS code(s): 8408); Tractors (other than tractors of heading 87.09). (HS code(s): 8701); Motor vehicles for the transport of ten or more persons, including the driver. (HS code(s): 8702); Motor cars and other motor vehicles principally designed for the transport of persons (other than those of heading 87.02), including station wagons and racing cars. (HS code(s): 8703); Motor vehicles for the transport of goods. (HS code(s): 8704); Special purpose motor vehicles, other than those principally designed for the transport of persons or goods (for example, breakdown lorries (wreckers), crane lorries (mobile cranes), fire fighting vehicles, concrete mixer lorries (concrete-mixers), road sweeper lorries (road sweepers), spraying lorries (spraying vehicles), mobile workshops, mobile radiological units). (HS code(s): 8705); Quality (ICS code(s): 03.120); Air quality (ICS code(s): 13.040); Test conditions and procedures in general (ICS code(s): 19.020); Road vehicles in general (ICS code(s): 43.020); Internal combustion engines for road vehicles (ICS code(s): 43.060); Commercial vehicles (ICS code(s): 43.080); Passenger cars. Caravans and light trailers (ICS code(s): 43.100)


Title, number of pages and language(s) of the notified document: Improvements for Heavy-Duty Engine and Vehicle Fuel Efficiency Test Procedures, and Other Technical Amendments; (47 page(s), in English)


Description of content: Proposed rule - The National Highway Traffic Safety Administration (NHTSA) is proposing minor technical amendments to the test procedures for heavy-duty engines and vehicles to improve accuracy and reduce testing burden. These amendments affect the certification procedures for fuel efficiency standards and related requirements. These proposed amendments increase compliance flexibility, harmonize with other requirements, add clarity, correct errors, and streamline the regulations. Given the nature of the proposed changes, NHTSA does not expect either significant environmental impacts or significant economic impacts for any sector.


Objective and rationale, including the nature of urgent problems where applicable: Prevention of deceptive practices and consumer protection; Protection of the environment; Quality requirements; Harmonization; Cost saving and productivity enhancement


Relevant documents:

87 Federal Register (FR) 56156, 13 September 2022; Title 49 Code of Federal Regulations (CFR) Part 535:

This proposed rule is identified by Docket Number NHTSA-2020-0079. The Docket Folder is available on at and provides access to primary and supporting documents as well as comments received. Documents are also accessible from by searching the Docket Number. WTO Members and their stakeholders are asked to submit comments to the USA TBT Enquiry Point by or before 4pm Eastern Time on 14 November 2022. Comments received by the USA TBT Enquiry Point from WTO Members and their stakeholders will be shared with the regulator and will also be submitted to the Docket on if received within the comment period.

G/TBT/N/USA/1620 and subsequent addenda and revisions - Improvements for Heavy-Duty Engine and Vehicle Test Procedures, and Other Technical Amendments identified by Docket Number EPA-HQ-OAR-2019-0307.


Proposed date of adoption: To be determined

Proposed date of entry into force: To be determined


Final date for comments: 14 November 2022


Texts available from: National enquiry point [ ] or address, telephone and fax numbers and email and website addresses, if available, of other body: