Bill

HB 25-1039

Commercial Vehicle Muffler Requirements

2025 Regular Session Introduced by Marc Catlin and 7 co-sponsors

Requires commercial vehicles to have functioning mufflers that meet noise standards; bans mods that raise noise and enables enforcement with penalties.

Governor Signed

WeVote Research Nonpartisan

Bill Summary · HB 25-1039

HB 25-1039 — Commercial Vehicle Muffler Requirements

Status: Governor Signed (May 15, 2025)
Introduced: January 8, 2025

Purpose / Intent

Based on the bill title and legislative history, HB 25-1039 is intended to regulate mufflers and exhaust systems on commercial vehicles. The apparent goals are to reduce excessive noise, improve public safety, and ensure commercial vehicles meet equipment and emissions/noise standards by establishing clear muffler requirements and enforcement mechanisms.

Note: The official bill text was not provided. The summary below identifies what the bill is likely to address based on the title and typical legislative practice, and highlights confirmed procedural facts. For exact statutory language, penalties, and exemptions, consult the enacted bill text.

Key provisions (inferred / typical)

The enacted measure likely includes one or more of the following provisions commonly found in muffler-regulation bills:
- A requirement that commercial motor vehicles operate with properly functioning mufflers and exhaust systems that meet manufacturer or state noise standards.
- A prohibition on modified, removed, or intentionally altered mufflers/exhaust systems that increase noise beyond specified limits.
- Defined noise limits or reference to an existing noise standard (e.g., dB limits or federal/state motor vehicle equipment standards).
- Inspection and compliance mechanisms: authority for law enforcement or vehicle inspectors to cite noncompliant vehicles during traffic stops or safety inspections.
- Penalties and corrective actions: fines, repair orders, or out-of-service orders until compliance is achieved.
- Possible exemptions or phased compliance for specific vehicle classes, emergency vehicles, historic vehicles, or equipment used in certain agricultural/industrial contexts.

Who is affected

Owners and operators of commercial vehicles (trucks, buses, delivery fleets, contractor vehicles).
Fleet managers and commercial vehicle repair shops (increased demand for repairs/inspections).
Law enforcement and vehicle inspection agencies (responsibility for enforcement).
Members of the public in communities affected by commercial vehicle noise.

Enforcement, penalties & timeline

Specific enforcement mechanisms, fine amounts, and effective dates were not included in the provided materials. The bill was amended in the House (April 17, 2025) before final passage.
Because the Governor signed the bill on May 15, 2025, statutory effective date provisions in the bill or general state law will determine when requirements take effect.

Legislative history (selected)

Introduced in House: Jan 8, 2025 (assigned to Transportation, Housing & Local Government)
House committee and floor actions: referred and amended (Jan–Apr 2025), passed by House April 21, 2025
Senate: introduced Apr 22, 2025; committee referrals and approvals in late April; passed Senate May 1, 2025
Sent to Governor and signed: May 13–15, 2025

Where to get the full bill text

For authoritative details (legal definitions, exact requirements, penalties, effective date, and any special exemptions), consult the official enrolled bill as signed by the Governor or the legislature’s bill page for HB 25-1039. Contact legislative staff or any of the primary sponsors for implementation guidance.

Compiled from official sources — confirm details with the bill’s official record.