In this chapter:
(1) “Air-conditioning equipment” means mechanical vapor compression refrigeration equipment used to cool a motor vehicle passenger or operator compartment.
(2) “Explosive cargo vehicle” means a motor vehicle used to transport explosives or a cargo tank truck used to transport a flammable liquid or compressed gas.
(2-a) “Golf cart” has the meaning assigned by § 551.401.
(2-b) “Highway maintenance or construction vehicle” means a highway or traffic maintenance or construction vehicle designated by the Texas Department of Transportation. The term includes equipment for:
(A) road maintenance or construction, including:
(i) equipment for snow removal, line striping, skid resistance testing, sweeping, spraying, guardrail repair, sign maintenance, and temporary traffic-control device placement or removal;
(ii) aerial platform lift machines; and
(iii) road profiler machines; and
(B) road construction or off-road use, including motor graders, road rollers, excavators, pneumatic tire equipment, movers, and tractors.
(3) “Light transmission” means the ratio of the amount of light that passes through a material to the amount of light that falls on the material and the glazing.
(4) “Luminous reflectance” means the ratio of the amount of light that is reflected by a material to the amount of light that falls on the material.
(5) “Multipurpose vehicle” means a motor vehicle that is:
(A) designed to carry 10 or fewer persons; and
(B) constructed on a truck chassis or with special features for occasional off-road use.
(5-a) “Road machinery” means a self-propelled vehicle that:
(A) was originally and permanently designed as machinery;
(B) is not designed or used primarily to transport persons or property; and
(C) is only incidentally operated on a highway.
(6) “Safety glazing material” includes only a glazing material that is constructed, treated, or combined with another material to reduce substantially, as compared to ordinary sheet or plate glass, the likelihood of injury to persons by an external object or by cracked or broken glazing material.
(6-a) “Service vehicle” means a highway or traffic maintenance vehicle that:
(A) is owned and operated on a highway by or for a governmental agency and performs a function requiring the use of a lamp or illuminating device in accordance with the standards and specifications adopted under § 547.105; or
(B) has a public service function, including public utility vehicles, tow trucks, and any vehicle designated as a service vehicle by the Texas Department of Transportation or as an escort flag vehicle under § 623.099.
(7) “Slow-moving vehicle” means:
(A) a motor vehicle designed to operate at a maximum speed of 25 miles per hour or less, not including an electric personal assistive mobility device, as defined by § 551.201; or
(B) a vehicle, implement of husbandry, or machinery, including road construction machinery, that is towed by:
(i) an animal; or
(ii) a motor vehicle designed to operate at a maximum speed of 25 miles per hour or less.
(8) “Slow-moving-vehicle emblem” means a triangular emblem that conforms to standards and specifications adopted by the director under § 547.104.
(9) “Sunscreening device” means a film, material, or device that meets the department’s standards for reducing effects of the sun.
(10) “Vehicle equipment” means:
(A) a system, part, or device that is manufactured or sold as original or replacement equipment or as a vehicle accessory; or
(B) a device or apparel manufactured or sold to protect a vehicle operator or passenger.
(11) “Neighborhood electric vehicle” has the meaning assigned by § 551.301.
(12) “Off-highway vehicle” has the meaning assigned by Section 551A.001.