Unless specifically defined in Texas Health and Safety Code,
Chapter 382, also known as the Texas Clean Air Act (TCAA) or in the
rules of the commission, the terms used by the commission have the
meanings commonly ascribed to them in the field of air pollution control.
In addition to the terms which are defined by the TCAA, the following
words and terms, when used in this chapter, have the following meanings,
unless the context clearly indicates otherwise.
  (1) Dual-fuel vehicle--Any motor vehicle or motor vehicle
engine engineered and designed to be operated on two different fuels,
but not a mixture of the two.
  (2) Emergency vehicle--A vehicle defined as an authorized
emergency vehicle according to Texas Transportation Code, §541.201(1).

  (3) Emissions--The emissions of oxides of nitrogen,
volatile organic compounds, carbon monoxide, particulate, or any combination
of these substances.
  (4) First safety inspection certificate--Initial Texas
Department of Public Safety (DPS) certificates issued through DPS-certified
inspection stations for every new vehicle found to be in compliance
with the rules and regulations governing safety inspections. Beginning
on the single sticker transition date as defined in this section,
the safety inspection certificates will no longer be used.
  (5) First vehicle registration--Initial vehicle registration
insignia sticker issued through the Texas Department of Motor Vehicles
for every new vehicle found to be in compliance with the rules and
regulations governing vehicle registration prior to the single sticker
transition date as defined in this section and vehicle registration
and safety inspections beginning on the single sticker transition
date.
  (6) Gross vehicle weight rating--The value specified
by the manufacturer as the maximum design loaded weight of a vehicle.
This is the weight as expressed on the vehicle's registration, and
includes the weight the vehicle can carry or draw.
  (7) Heavy-duty vehicle--Any passenger vehicle or truck
capable of transporting people, equipment, or cargo, that has a gross
vehicle weight rating (GVWR) greater than 8,500 pounds, and is required
to be registered under Texas Transportation Code, §502.002. For
purposes of the mobile emission reduction credit trading program the
heavy-duty class is divided into the following subclasses:
    (A) Light heavy-duty vehicle--Any passenger vehicle
or truck capable of transporting people, equipment, or cargo that
has a GVWR greater than 8,500 pounds, but less than or equal to 10,000
pounds.
    (B) Medium heavy-duty vehicle--Any passenger vehicle
or truck capable of transporting people, equipment, or cargo that
has a GVWR greater than 10,000 pounds, but less than or equal to 19,500
pounds.
    (C) Heavy heavy-duty vehicle--Any passenger vehicle
or truck capable of transporting people, equipment, or cargo that
has a GVWR greater than 19,500 pounds.
  (8) Inherently low emission vehicle--A vehicle as defined
by 40 Code of Federal Regulations Part 88.
  (9) Law enforcement vehicle--Any vehicle controlled
by a local government and primarily operated by a civilian or military
police officer or sheriff, or by state highway patrols, or other similar
law enforcement agencies, and used for the purpose of law enforcement
activities including, but not limited to, chase, apprehension, surveillance,
or patrol of people engaged in or potentially engaged in unlawful
activities.
  (10) Light-duty vehicle--Any passenger vehicle or truck
capable of transporting people, equipment, or cargo that has a gross
vehicle weight rating (GVWR) less than or equal to 8,500 pounds and
registered or required to be registered under Texas Transportation
Code, §502.002. For purposes of the mobile emission reduction
credit trading program the light-duty class is divided into the following
subclasses:
    (A) Light-duty vehicle--Any passenger vehicle capable
of seating 12 or fewer passengers that has a GVWR less than or equal
to 6,000 pounds.
    (B) Light-duty truck 1--Any passenger truck capable
of transporting people, equipment, or cargo that has a GVWR less than
or equal to 6,000 pounds.
    (C) Light-duty truck 2--Any passenger truck capable
of transporting people, equipment, or cargo that has a GVWR greater
than 6,000 pounds but less than or equal to 8,500 pounds.
  (11) Loaded mode inspection and maintenance test--A
measurement of the tailpipe exhaust emissions of a vehicle while the
drive wheel rotates on a dynamometer, which simulates the full weight
of the vehicle driving down a level roadway. Loaded test equipment
specifications must meet United States Environmental Protection Agency
requirements for acceleration simulation mode equipment.
  (12) Low emission vehicle (LEV)--A vehicle in a class
or category of vehicles that has been certified by the United States
Environmental Protection Agency for any model year to meet:
    (A) the LEV standards applicable under 42 United States
Code, Part C, Subchapter II, §§7581 et
seq.; or
    (B) emission limits at least as stringent as the applicable
LEV standards for the Federal Clean Fuel Fleet program under 40 Code
of Federal Regulations §§88.104-94, 88.105-94, and 88.311-93,
as published in the Federal Register on
September 30, 1994 (59 FR 50042).
  (13) Mass transit authority--A transportation or transit
authority or department established under Chapter 141, 63rd Legislature
(1973), as defined in Texas Transportation Code, Chapters 451 - 453
(relating to Metropolitan Rapid Transit Authorities, Regional Transportation
Authorities, and Municipal Transit Departments) that operates a mass
transit system under any of those laws.
  (14) Reformulated gasoline--Gasoline that has been
certified as a reformulated gasoline under the federal certification
regulations adopted in accordance with 42 United States Code, §7545(k).

  (15) Single sticker transition date--The transition
date of the single sticker system is the later of March 1, 2015 or
the date that the Texas Department of Motor Vehicles and the Texas
Department of Public Safety concurrently implement the single sticker
system required by Texas Transportation Code, §502.047.
  (16) Texas Inspection and Maintenance State Implementation
Plan--The portion of the Texas state implementation plan that includes
the procedures and requirements of the vehicle emissions inspection
and maintenance program as adopted by the commission May 29, 1996
in accordance with 40 Code of Federal Regulations Part 51, Subpart
S, issued November 5, 1992; the United States Environmental Protection
Agency flexibility amendments dated September 18, 1995; and the National
Highway Systems Designation Act of 1995. A copy of the Texas Inspection
and Maintenance State Implementation Plan is available at the Texas
Commission on Environmental Quality, 12100 Park 35 Circle, Austin,
Texas, 78753; mailing address: P.O. Box 13087, MC 166, Austin, Texas
78711-3087.
  (17) Tier I federal emission standards--The standards
are defined in 42 United States Code, §7521, and in 40 Code of
Federal Regulations Part 86. The phase-in of these standards began
in model year 1994.
  (18) Ultra low emission vehicle--A vehicle as defined
by 40 Code of Federal Regulations Part 88.
  (19) Vehicle registration--Vehicle characteristics,
corresponding owner information, and registration expiration date
contained in the Texas Department of Motor Vehicles registration system.

  (20) Vehicle registration insignia sticker--The sticker
issued through the Texas Department of Motor Vehicles (DMV) or county
tax assessor-collector to be affixed on the windshield of a vehicle
compliant with the DMV regulations. Beginning on the single sticker
transition date as defined in this section, the vehicle registration
insignia sticker will be used as proof of compliance with inspection
and maintenance program requirements, the DMV's rules and regulations
governing vehicle registration, and the Texas Department of Public
Safety's rules and regulations governing safety inspections.
  (21) Zero emission vehicle--A vehicle as defined by
40 Code of Federal Regulations Part 88.