Maryland Engine & Jake Brake Rules

Maryland does not ban the act of engine braking, but it has real teeth: a commercial truck with an engine brake must run it through a working muffler in constant operation (Md. Transportation 22-611). Break that and the fine is $250 to $1,000 on a first offense. Local 'No Engine Brake' signs add town fines and show up in western Maryland's mountains and quiet suburbs. Stay muffled and keep the brake for the grades.

Ban scopeLocal / posted

Muffler lawYes (the legal hook)

Where postedNo statewide ban on the act, but Maryland's retarder-muffler law bites statewide

FineState violation under Transportation 22-611: first offense $250 to $1,000; second or later offense $500 to $1,000

01 The rule

How Maryland handles engine braking

02 On the road

What to watch for

Ban scope: Local / posted
Where posted & enforced: No statewide ban on the act, but Maryland's retarder-muffler law bites statewide. Local 'No Engine Brake' signs turn up in western Maryland's mountains (US-219 and the I-68 grades near Frostburg and Cumberland) and in noise-sensitive suburbs and small towns on truck routes. Enforcement is modest outside those spots.
Muffler / noise law: Yes, the real legal hook
Fine: State violation under Transportation 22-611: first offense $250 to $1,000; second or later offense $500 to $1,000. Local 'No Engine Brake' signs carry separate town noise-ordinance fines.

Maryland Engine Brake FAQ

Are engine brakes banned in Maryland?

Maryland has no statewide ban. The restriction is local and posted on "NO ENGINE BRAKE" signs. Maryland does not ban the act of engine braking, but it has real teeth: a commercial truck with an engine brake must run it through a working muffler in constant operation.

Where are the "NO ENGINE BRAKE" signs in Maryland?

No statewide ban on the act, but Maryland's retarder-muffler law bites statewide. Local 'No Engine Brake' signs turn up in western Maryland's mountains (US-219 and the I-68 grades near Frostburg and Cumberland) and in noise-sensitive suburbs and small towns on truck routes. Enforcement is modest outside those spots.

What is the fine for using an engine brake where it is banned in Maryland?

State violation under Transportation 22-611: first offense $250 to $1,000; second or later offense $500 to $1,000. Local 'No Engine Brake' signs carry separate town noise-ordinance fines.

Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://codes.findlaw.com/md/transportation/md-code-trans-sect-22-611/. See our Terms & Disclaimer.

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Maryland Engine & Jake Brake Rules

How Maryland handles engine braking

What to watch for

Maryland Engine Brake FAQ

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