Pipeline and Hazardous Materials Safety Administration

Abbreviations Used

CFR - Code of Federal Regulations

DOT - U.S. Department of Transportation

EPA - U.S. Environmental Protection Agency

FR - Federal Register

HM-XXX - Hazardous Material Regulations Docket of RSPA (e.g., HM-181)

HMR - Hazardous Materials Regulations (49 CFR Parts 171-180) issued by DOT under 49 U.S.C. §§ 5101-5127

HMTA - Hazardous Materials Transportation Act, 49 App. U.S.C. 1801-1819 (codified at 49 U.S.C. §§ 5101-5127, eff. 7/6/94)

HRCQ - Highway route controlled quantities (of RAM)

IR-XX - Inconsistency Ruling issued by DOT (e.g., IR-18)

IR-XX(A) - Decision on Appeal re Inconsistency Ruling IR-XX (e.g., IR-18(A))

IRA-XX - Inconsistency Ruling Application filed with DOT (e.g., IRA-44)

LNG - Liquefied natural gas

LPG - Liquefied petroleum gas

"Nine-pack" - Group of nine inconsistency rulings (*IR-7 through *IR-15) issued by RSPA on 11/27/84 (49 FR 46632 et seq.)

NRC - Nuclear Regulatory Commission

OHMS - Office of Hazardous Materials Safety, RSPA

PD-XX(F) - Preemption Determination issued by DOT/FWHA or DOT/FMCSA (Routing) (e.g., PD-3(F))

PD-XX(R) - Preemption Determination issued by DOT/RSPA (e.g., PD-2(R))

PD-XX(RF) - Preemption Determination issued jointly by RSPA and FMCSA and (e.g., PD-20(RF))

PDA-XX - Preemption Determination application filed with DOT (e.g., PDA-6(R))

RAM - Radioactive materials

RSPA - Research and Special Programs Administration

An asterisk (*) denotes a case, IR or other provision involving only RAM.

A cross-hatch (#) denotes a case, IR or other provision involving both RAM and other hazardous material.

Please advise Ed Bonekemper, RSPA's Assistant Chief Counsel for Hazardous Materials Safety (202-366-4400), of any additions, corrections or other changes.