2013 Maryland Code
§ 22-611 - Operation of a commercial motor vehicle equipped with engine brakes
(a) In this section, “engine brake” means an add-on engine compression brake for diesel engines.
(b) A person may not operate a commercial motor vehicle equipped with an engine brake unless the engine brake is connected to a properly functioning exhaust muffler system in constant operation when the vehicle’s ignition is engaged.
(c) A person may not disable the exhaust muffler system of a commercial motor vehicle that is equipped with an engine brake except to make a bona fide repair or replacement.
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