Section 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.Added by 2017 Md. Laws, Ch. 697,Sec. 1, eff. 10/1/2017.