Regulations last checked for updates: Jan 31, 2025

Title 40 - Protection of Environment last revised: Nov 08, 2025
All TitlesTitle 40Chapter IPart 1037Subpart IAppendix Appendix C - Appendix C to Part 1037—Emission Control Identifiers
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Appendix Appendix C - Appendix C to Part 1037—Emission Control Identifiers

This appendix identifies abbreviations for emission control information labels, as required under § 1037.135.

Vehicle Speed Limiters —VSL—Vehicle speed limiter —VSLS—“Soft-top” vehicle speed limiter —VSLE—Expiring vehicle speed limiter —VSLD—Vehicle speed limiter with both “soft-top” and expiration Idle Reduction Technology —IRT5—Engine shutoff after 5 minutes or less of idling —IRTE—Expiring engine shutoff Tires —LRRA—Low rolling resistance tires (all) —LRRD—Low rolling resistance tires (drive) —LRRS—Low rolling resistance tires (steer) Aerodynamic Components —ATS—Aerodynamic side skirt and/or fuel tank fairing —ARF—Aerodynamic roof fairing —ARFR—Adjustable height aerodynamic roof fairing —TGR—Gap reducing tractor fairing (tractor to trailer gap) Other Components —ADVH—Vehicle includes advanced hybrid technology components —ADVO—Vehicle includes other advanced-technology components (i.e., non-hybrid system) —INV—Vehicle includes innovative (off-cycle) technology components —ATI—Automatic tire inflation system —TPMS—Tire pressure monitoring system [89 FR 29792, Apr. 22, 2024]
authority: 42 U.S.C. 7401—7671q
source: 81 FR 74048, Oct. 25, 2016, unless otherwise noted.
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