2019 Maryland Code
Transportation
Title 21 - Vehicle Laws -- Rules of the Road
Subtitle 11 - Miscellaneous Rules
§ 21-1131. Causing diesel emissions to discharge onto another prohibited; exceptions.

    (a)    Except as provided in subsection (b) of this section, a person may not knowingly or intentionally cause a diesel–powered motor vehicle to discharge clearly visible smoke, soot, or other exhaust emissions onto another person or motor vehicle.

    (b)    This section does not apply to a person operating:

        (1)    A diesel–powered vehicle that discharges visible exhaust as the result of normal acceleration or towing;

        (2)    A commercial vehicle with a gross weight of 10,000 pounds or more; or

        (3)    A construction vehicle operating at a construction site.

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