(a)
- (1) Any person owning or operating a motor vehicle including, but not limited to automobiles and trucks, incorporating a system for the control or emissions from the crankcase or exhaust system, or for the control or evaporative emissions, shall maintain the system in good operable condition and shall use it at all times that the vehicle is operated.
- (2) The operator of such vehicle shall not intentionally make the system inoperable and shall not remove it except to install a proper replacement.
(b)
- (1) No person shall cause or permit the emission of an air contaminant from a motor vehicle including, but not limited to, automobiles and trucks of a density exceeding thirty percent (30%) opacity, except during acceleration and gear shifting for periods not to exceed five (5) seconds.
- (2) Where the presence of uncombined water is the only reason for failure of an emission to comply herewith, this section shall not apply.
- (c) Railroad locomotives shall be maintained and operated such as to minimize visible emissions.
- (d) The provisions of this subpart shall not be applicable to the emission of air contaminants from motor exhaust of tractors, graders, earthmovers, or other mobile and portable equipment used exclusively in land clearing, agricultural, or road building operations, provided, however, that prime movers used for the transportation of said portable and mobile equipment shall not be exempt.