UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

NATIONAL VEHICLE AND FUEL EMISSIONS LABORATORY

2000 TRAVERWOOD DRIVE

ANN ARBOR, MI 48105-2498

OFFICE OF

AIR AND RADIATION

July 28, 2015

MEMORANDUM

SUBJECT: Preamble and Regulation References for Key Trailer Provisions

FROM: Tad Wysor, Assessment and Standards Division, Office of Transportation and Air 

Quality

TO: Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and 

Heavy-Duty Engines and Vehicles - Phase 2 - Docket EPA-HQ-OAR-2014-0827

EPA created two versions of a reference guide for key trailer provisions in the preamble and 

regulations. The first version (dated July 1, 2015) referenced page numbers from the preamble 

that was available on EPA’s website prior to publication in the Federal Register. This version 

was shared with the Truck Trailer Manufacturers Association (TTMA) during our meeting on 

July 9, 2015. The second version of the guide (dated July 17, 2015) referenced preamble page 

numbers from the Federal Register, and was shared with TTMA during our meeting on July 22, 

2015.

Attachment: 

Preamble and Regulation References for Key Trailer Provisions, 7/1/15 version

Preamble and Regulation References for Key Trailer Provisions, 7/17/15 version
Preamble and Regulation References for Key Proposed Trailer Provisions, 

HD Phase 2 NPRM (as of 7/1/15)

Overall Organization of the Trailer Provisions 

 Preamble: We expect that discussions of the proposed provisions of most interest to trailer manufacturers will be in Section IV 

of the preamble (P. 253-323 of the pre-publication version available on EPA’s website).

 Regulations: The regulatory language for the trailer program also applies in many cases to other heavy-duty segments and is 

distributed among the regulatory provisions, mostly in 40 CFR 1037.

 Regulatory Impact Analysis: Analyses supporting the proposed provisions are described in some detail in the preamble; more 

details of our analyses for the trailer program (including EPA’s test results used to create the proposed aerodynamic 

performance bins, and the process deriving the GEM-based equation proposed for certification) are in Chapter 2.10, p. 2-152 to 

2-190 of the RIA.

Preamble Regulations

Proposed Trailer Standards and Phase-In IV.C, p. 259-269

Trailer Definition IV, p. 253 §1037.801

Covered Trailer Categories IV.C, p. 261 §1037.230(a)(3) 

Excluded Trailers IV.C.5, p. 266 §1037.5(g)

Proposed Trailer Standards and Phase-In

o Box trailer standards (full-aero) IV.C.2, Table IV-2, p. 263 §1037.107(a) 

o Partial-aero box trailer and non-aero standards IV.C.5, p. 267 §1037.107(a) 

o Non-box trailer standards IV.C.2, p. 263 §1037.107(a) 

Proposed Compliance Provisions IV.F, p. 302-323 Subpart C

Basic Compliance process IV.F.2, p. 303-305 §1037.201

o Establishing trailer families/subcategories p. 304 §1037.230(a)(3) 

o Information needed for certification application p. 305 §1037.205 

o End of year reporting p. 305 §1037.250 

Use of the compliance equation IV.F.1, p. 302; 

IV.F.4, p. 313

§1037.515 

o What inputs would be needed? IV.F.4, p. 313 §1037.515(a) 

o Acceptable data sources

 Tire Rolling Resistance Testing IV.F.3.a., p. 306 §1037.515(b) 

 Trailer Aerodynamic Testing (policy) IV.F.3.b, p. 307 §1037.515(c), 

§1037.525(a) 

 Trailer Aerodynamic Testing (methods) §1037.527-533

 Demonstrating weight reduction IV.F.4, p. 313 §1037.515(d) 

 Data from pre-approved technologies IV.F.3.b.iv, p. 312 §1037.211(b), (c) 

 SmartWay-verified technologies IV.F.6.b, p 321 §1037.150(n)

Proposed optional averaging provisions IV.F.6.a, p 317 §1037.107(a)(5), 

Subpart H except 

§1037.715 & 720

o See also the hypothetical examples in the docket memo: 

“2015-04-14_MemoToDocket_TrailerComplianceScenarios.pdf”. 

Attached; will also be available in docket: EPAHQ-OAR-2014-0827

Small Business Manufacturers

o Small Manufacturer definition §1037.801

o Small Business Flexibilities IV.F.6.d, p. 322 §1037.150(c)

Other compliance provisions IV.F.5, p. 314-17

o Significance of trailer “useful life” IV.F.5, p. 314 §1037.107(c)

o Trailer labeling provisions IV.F.5, p. 315 §1037.135

Appendix III

o Emission-related warranty provisions IV.F.5, p. 315 §1037.120

o Maintenance provisions (owners manual) IV.F.5, p. 316 §1037.125(h)

o Modifying emission control equipment after the “useful life” IV.F.5, p. 317 §1037.655
Preamble and Regulation References for Key Proposed Trailer Provisions, 

HD Phase 2 NPRM (Revised 7-17-2015)

Overall Organization of the Trailer Provisions 

 Preamble: We expect that discussions of the proposed provisions of most interest to trailer manufacturers will be in Section IV 

of the preamble (P. 40253-40285 of the Federal Register, also available on EPA’s website).

 Regulations: The regulatory language for the trailer program also applies in many cases to other heavy-duty segments and is 

distributed among the regulatory provisions, mostly in 40 CFR 1037.

 Regulatory Impact Analysis: Analyses supporting the proposed provisions are described in some detail in the preamble; more 

details of our analyses for the trailer program (including EPA’s test results used to create the proposed aerodynamic 

performance bins, and the process deriving the GEM-based equation proposed for certification) are in Chapter 2.10, p. 2-152 to 

2-190 of the RIA, also available on the EPA website).

Preamble Regulations

Proposed Trailer Standards and Phase-In IV.C, p. 40255-260

Trailer Definition IV, p. 40253 §1037.801

Covered Trailer Categories IV.C, p. 40256 §1037.230(a)(3) 

Excluded Trailers IV.C.5, p. 40259 §1037.5(g)

Proposed Trailer Standards and Phase-In

o Box trailer standards (full-aero) IV.C.2, Table IV-2, p. 40257 §1037.107(a) 

o Partial-aero box trailer and non-aero standards IV.C.5, p. 40259 §1037.107(a) 

o Non-box trailer standards IV.C.2, p. 40257-8 §1037.107(a) 

Proposed Compliance Provisions IV.F, p. 40276-85 Subpart C

Basic Compliance process IV.F.2, p. 40276-7 §1037.201

o Establishing trailer families/subcategories p. 40277 §1037.230(a)(3) 

o Information needed for certification application p. 40277 §1037.205 

o End of year reporting p. 40277 §1037.250 

Use of the compliance equation IV.F.1, p. 40276; 

IV.F.4, p. 40281

§1037.515 

o What inputs would be needed? IV.F.4, p. 40281 §1037.515(a) 

o Acceptable data sources

 Tire Rolling Resistance Testing IV.F.3.a., p. 40278 §1037.515(b) 

 Trailer Aerodynamic Testing (policy) IV.F.3.b, p. 40278 §1037.515(c), 

§1037.525(a) 

 Trailer Aerodynamic Testing (methods) §1037.527-533

 Demonstrating weight reduction IV.F.4, p. 40281 §1037.515(d) 

 Data from pre-approved technologies IV.F.3.b.iv, p. 40280 §1037.211(b), (c) 

 SmartWay-verified technologies IV.F.6.b, p 40284 §1037.150(n)

Proposed optional averaging provisions IV.F.6.a, p 40283 §1037.107(a)(5), 

Subpart H except 

§1037.715 & 720

o See also the hypothetical examples in the docket memo: 

“2015-04-14_MemoToDocket_TrailerComplianceScenarios.pdf”. 

Attached; will also be available in docket: EPA-HQOAR-2014-0827

Small Business Manufacturers

o Small Manufacturer definition §1037.801

o Small Business Flexibilities IV.F.6.d, p. 40285 §1037.150(c)

Other compliance provisions IV.F.5, p. 40281-82

o Significance of trailer “useful life” IV.F.5, p. 40281-82 §1037.107(c)

o Trailer labeling provisions IV.F.5, p. 40282 §1037.135

Appendix III

o Emission-related warranty provisions IV.F.5, p. 40282 §1037.120

o Maintenance provisions (owners manual) IV.F.5, p. 40282 §1037.125(h)

o Modifying emission control equipment after the “useful life” IV.F.5, p. 317 §1037.655