Colorado Engine & Jake Brake Rules
No statewide ban on engine braking in Colorado. State law only requires a commercial truck with a compression brake to run a working muffler (C.R.S. 42-4-225), a $500 fine that jumps to $1,000 in July 2027. The real restrictions are local: CDOT posts signs only where a town passes an ordinance and commits to enforce it. Watch Dillon, Silverthorne, Glenwood Springs, and the I-70 towns. Keep using your Jake on open grades with no sign.
How Colorado handles engine braking
No statewide ban on engine braking in Colorado. State law only requires a commercial truck with a compression brake to run a working muffler (C.R.S. 42-4-225), a $500 fine that jumps to $1,000 in July 2027. The real restrictions are local: CDOT posts signs only where a town passes an ordinance and commits to enforce it. Watch Dillon, Silverthorne, Glenwood Springs, and the I-70 towns. Keep using your Jake on open grades with no sign.
What to watch for
- Ban scope: Local / posted
- Where posted & enforced: Heavy posted enforcement. CDOT installs signs only after a town passes an ordinance and local police commit to enforce it. Active zones include Dillon and Silverthorne, Glenwood Springs, Idaho Springs and Georgetown on I-70, plus Durango and Steamboat. Tickets get written in these mountain towns.
- Muffler / noise law: Yes, the real legal hook
- Fine: State muffler-with-compression-brake violation is $500 (C.R.S. 42-4-225); rises to $1,000 in July 2027 under HB 25-1039. Local 'no engine brake' ordinance tickets typically run about $50-$500.
Colorado Engine Brake FAQ
Are engine brakes banned in Colorado?
Where are the "NO ENGINE BRAKE" signs in Colorado?
What is the fine for using an engine brake where it is banned in Colorado?
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 Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it.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://www.codot.gov/safety/traffic-safety/assets/documents/engine-brake-noise-ordinance-sign-warrant-guide.pdf. See our Terms & Disclaimer.
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