   
  
G/TBT/N/USA/1620/Rev.1/Add.2  
 
2 August 2022  
(22-5785) Page: 1/2 
Committee on Technical Barriers to Trade  Original: English  
 
 
NOTIFICATION  
Addendum  
The following communication , dated  2 August 2022, is being circulated at the request of the 
delegation of the United States of America . 
 
_______________  
 
 
Title:  Improvements for Heavy -Duty Engine and Vehicle Test Procedures, and Other Technical 
Amendments  
 
Reason for Addendum:  
[ ] Comment period changed - date:   
[ ] Notified measure adopted - date:  
[X] Notified measure published - date: 28 July 2022  
[X] Notified measure enters into force - date: 29 August 2022  
[X] Text of final measure available from1:  
https://www.govinfo.gov/content/pkg/FR -2022-07-28/html/ 2022-16031.htm  
https://www.govinfo.gov/content/pkg/FR -2022-07-28/pdf/2022 -16031.pdf  
https://members.wto.org/crnattachments/2022/TBT/USA/final_measure/22_5100_00_
e.pdf 
[ ] Notified measure withdrawn or revoked - date:  
Relevant symbol if measure re -notified:   
[ ] Content or scope of notified measure changed  and text available from1:  
New deadline for comments (if applicable):   
[ ] Interpretive guidance issued and text available from1:  
[ ] Other:  
 
Description:  TITLE: Improvements for Heavy -Duty Engine and Vehicle Test Procedures  
AGENCY: Environmental Protection Agency (EPA)  
ACTION: Final rule  
SUMMARY: This final rule includes corrections, clarifications, additional flexibilities, and adjustment 
factors to improve the Greenhouse gas Emissions Model (GEM) compliance tool for heavy -duty 
vehicles while more closely matching  the outputs produced by the original GEM version 3.0 that was 
used to establish the CO2 standards for Model Years 2021 and later in the 2016 Heavy -duty Phase 
2 final rule. Given the nature of this rule, there will be neither significant environmental impa cts nor 
significant economic impacts.  
 
1 This information can be provided by including a website address, a pdf attachment, or other 
information on where the text of the final /modified  measure and/or interpretive guidance can be obtained.  G/TBT/N/USA/1620/Rev.1/Add.2  
 
- 2 - 
 
  DATES: This final rule is effective on 29 August 2022. The incorporation by reference of certain 
publications listed in this regulation is approved by the Director of the Federal Register as of 29 
August 2022.  
This fin al rule and previous actions notified under the symbol G/TBT/N/USA/1620  are identified by 
Docket Number EPA -HQ-OAR-2019-0307. The Docket Folder is available on Regulation s.gov at 
https://www.regulations.gov/docket/EPA -HQ-OAR-2019-0307/document  and provides access to 
primary and supporting documents as well as comments received. Documents are a lso accessible 
from Regulations.gov  by searching the Docket Number.  
__________  
 
 