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DOT/NHTSA RIN: 2127-AK84 Publication ID: Spring 2011 
Title: ●FMVSS No. 121, Air Brake Systems, Response to Petitions for Reconsideration  
Abstract: This rulemaking would address petitions for reconsideration received by NHTSA to a July, 2009 final rule that reduced stopping distance requirements for truck tractors and other heavy vehicles. The petitioners have suggested that the new stopping distance requirements for truck tractors that can't achieve a top speed of 60 mph may not be achievable and that unique braking systems would need to be developed. NHTSA has conducted additional testing at these lower speeds and would make slight adjustments to the stopping distance tables as needed. With these adjustments we believe truck manufacturers would not incur any additional costs over and above the costs associated with installing improved braking systems as indicated in the July 2009 Final Rule. That is, they would not need to make further vehicle modifications or build special systems to meet the stopping distances from lower initial test speeds. 
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  07/00/2011    
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-AJ37 
Agency Contact:
Jeffrey Woods
Office of Crash Avoidance Standards
Department of Transportation
National Highway Traffic Safety Administration
NVS-122, 1200 New Jersey Avenue, SE,
Washington, DC 20590
Phone:202-366-2720
Fax:202-366-4329
Email: jeff.woods@dot.gov