HB 25-1039 Colorado House · 2025 Regular Session

Commercial Vehicle Muffler Requirements

Summary
The act requires all commercial vehicles to have a muffler. The muffler must be located so that it may be visually inspected to ensure it is present, intact, and functioning properly; except that a muffler need not be visible for inspection if certain documentation is present in the commercial vehicle and available for inspection by a peace officer. Standards are set for the necessary documentation. The act increases the fine for a violation from $500 to $1,000. The fine is not imposed if the owner or operator can show that a muffler was installed before the citation was issued and that the muffler complied with the manufacturing noise standards for the model year of the commercial vehicle. The fine is decreased by 50% if a muffler is installed within 30 days after the citation is written. The act applies to commercial vehicles with an internal combustion engine and does not apply to farm vehicles. State agencies must include language in construction contracts stating that a contractor's or subcontractor's commercial vehicle that enters a public project site is required to comply with the act. (Note: This summary applies to this bill as enacted.)
Bill status signed all 5 stages cleared
Introduction
Jan 2025
Committee Review
Apr 2025
House Passage
Apr 2025
Senate Passage
May 2025
Signed into Law
May 2025
Introduced Jan 8, 2025 Signed May 15, 2025
Maddy AI version diff · 7 comparisons

What changed between versions

Rerevised (05/01/2025) Revised (04/30/2025) · 1 edit
MINOR
The bill revision adds a new provision allowing courts to reduce fines by 50% for commercial vehicle muffler violations if the owner or operator installs an appropriate muffler within 30 days of receiving the citation. This change creates a grace period and financial incentive for commercial vehicle operators to correct muffler violations quickly rather than facing full penalties.
Scope change
The bill's scope now includes a specific enforcement mechanism for commercial vehicle muffler violations that was not present in the previous version.
ENFORCEMENT

New requirement for courts to reduce fines by 50% when commercial vehicle owners/operators provide proof of muffler installation within 30 days of citation.

Floor votes · Senate May 1, 2025 · House Apr 21, 2025

How they voted

305
Passed
Total votes 35
May 1, 2025
D Democratic23
23 Yea
100% Yea
R Republican12
7 Yea 5 Nay
58% Yea
Vote distribution
All Yea All Nay Mixed No data
Full legislative history

Actions timeline

Total actions
14
Key actions
5
Committee
4
May 15, 2025
Signed into law
Governor Signed
executive
May 1, 2025
Upper · Passed
Senate Third Reading Passed - No Amendments
upper
Apr 30, 2025
Upper · Passed
Senate Committee on Appropriations Refer Unamended - Consent Calendar to Senate Committee of the Whole
upper
Apr 28, 2025
Committee
Senate Committee on Transportation & Energy Refer Unamended to Appropriations
upper
Apr 22, 2025
Introduced
Introduced In Senate - Assigned to Transportation & Energy
upper
Apr 21, 2025
Lower · Passed
House Third Reading Passed - No Amendments
lower
Apr 15, 2025
Lower · Passed
House Committee on Appropriations Refer Unamended to House Committee of the Whole
lower
Jan 28, 2025
Committee
House Committee on Transportation, Housing & Local Government Refer Amended to Appropriations
lower
Jan 8, 2025
Introduced
Introduced In House - Assigned to Transportation, Housing & Local Government
lower
4 primary · 4 co-sponsors

Sponsors