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DOT/NHTSA RIN: 2127-AL11 Publication ID: 2012 
Title: ●FMVSS No. 121, Air Brake Systems; Response to Petition for Reconsideration 
Abstract: This rulemaking would respond to a petition for reconsideration of a July 27, 2011 final rule. In response to earlier petitions, the agency made small adjustments to the new stopping distance requirements for truck tractors when tested from initial speeds below 60 mph. In this new petition, the petitioners ask for (1) additional lengthening of the lower initial speed stopping distance requirements for non-typical truck tractors, and (2) that stopping distance requirements for 20 and 25 mph initial speeds be removed from the standard, since they do not apply to any truck tractors. Granting or denying the first requested change would have little to no associated costs. Granting or denying the second requested change would have no associated costs. 
Agency: Department of Transportation(DOT)  Priority: Substantive, Nonsignificant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 49 CFR 571.121   
Legal Authority: 49 USC 30111    49 USC 30115    49 USC 30117    49 USC 30166    49 USC 322    delegation of authority at 49 CFR 1.50   
Legal Deadline:  None
Timetable:
Action Date FR Cite
Final Action  04/00/2013 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Information URL: www.regulations.gov   Public Comment URL: www.regulations.gov  
RIN Data Printed in the FR: No 
Related RINs: Related to 2127-AK84 
Agency Contact:
Patrick Smith
Safety Engineer
Department of Transportation
National Highway Traffic Safety Administration
1200 New Jersey Avenue SE,
Washington, DC 20590
Phone:202 366-6040
Email: patrick.smith@dot.gov