HB 4470 amends Michigan's penal code to designate specific portions of the Mackinac Bridge (those not open to or intended for public use) as a "key facility" under existing law. This means unauthorized entry onto these bridge sections - when enclosed by barriers like water and properly posted with signage - would become a felony punishable by up to 4 years in prison or a $2,500 fine. The bill adds the Mackinac Bridge to a list of protected critical infrastructure, including power plants, water facilities, and chemical plants, all requiring physical barriers and visible signage to enforce entry restrictions. It does not change current penalties or posting requirements but extends them specifically to the Mackinac Bridge's restricted areas.
HB 4301 expands Michigan's definition of "authorized emergency vehicle" in the Vehicle Code (MCL 257.2 and 257.698) to include specific new categories. It adds vehicles owned by the Michigan Mutual Aid Box Alarm System during emergencies, clarifies that road service vehicles (like tow trucks) may use flashing amber lights while assisting disabled vehicles, and allows federally recognized nonprofits to use emergency lights during disaster response. The bill also clarifies when certain colored lights (red, blue, amber, green) may be used on emergency vehicles, including for snow removal, spill response, and funeral processions. This directly affects emergency responders, road service providers, and nonprofit organizations during crisis operations.
HB 4302 creates an exception to Michigan's commercial driver license (CDL) requirements for authorized emergency vehicles operated by the Michigan Mutual Aid Box Alarm System. This means drivers operating these specific emergency vehicles do not need to obtain the standard CDL or related endorsements required for commercial vehicles. The bill amends Michigan's Vehicle Code (MCL 257.312e) to explicitly exempt these vehicles from the general CDL rules. The exception directly affects personnel operating emergency vehicles under the Michigan Mutual Aid Box Alarm System, allowing them to operate without meeting standard CDL qualifications.
HB 4180 removes the sales tax requirement for motor fuel sales in Michigan by amending the state tax code. It directly affects gas stations and fuel retailers by exempting motor fuel transactions from the standard sales tax. The bill creates a new tax exemption provision (Section 4gg) in the tax code, specifically excluding motor fuel sales from taxable transactions. This change became effective immediately upon the Governor's approval on October 7, 2025.
SB 578 creates a new Neighborhood Roads Fund to support maintenance of local neighborhood streets and modifies the existing Movable Bridge Fund to improve bridge infrastructure funding. The bill changes how these funds are managed and allocated, directly affecting local governments responsible for road and bridge upkeep. Key provisions include establishing dedicated funding sources for neighborhood roads and adjusting eligibility rules for bridge repair projects. These changes clarify state funding streams for community infrastructure without altering tax rates or new construction policies.
HB 4183 increases the motor fuel tax rate and expands the types of fuels subject to the tax under Michigan law. It directly affects motor fuel sellers (like gas stations) and consumers through higher costs for gasoline and other taxed fuels. The bill amends Section 8 of the 2000 Motor Fuel Tax Act (MCL 207.1008) to implement these changes, which became law immediately upon approval by the Governor on October 7, 2025.
HB 4951 creates a new tax on marijuana sales to fund state road infrastructure projects. It directly affects marijuana businesses (which pay the tax) and state transportation budgets (which receive the revenue). The key mechanism establishes a dedicated funding stream, redirecting tax revenue from cannabis sales toward repairing and maintaining roads, rather than general state funds. The bill became law immediately upon the Governor's approval on October 7, 2025.
HB 4522 modifies Michigan's vehicle code to require heavy trucks (over 10,000 pounds gross weight) to drive in any lane on freeways with three or more lanes for travel in the same direction, rather than restricting them to the rightmost lanes. This directly affects commercial truck drivers and fleet operators on Michigan freeways. The law specifies exceptions allowing trucks to use the right lane only for left turns, safety reasons, or construction-related lane closures. It also prohibits local governments from creating conflicting lane-use ordinances for these situations.
HB 4349 allows Michigan cities to contract with private companies for the maintenance or improvement of private roads within their boundaries. This change directly affects cities seeking to partner with outside contractors for road work on privately owned streets, removing a prior restriction. The bill amends the Municipal Home Rule Act (MCL 117.1-117.38) by adding Section 5l, granting cities this new authority. The legislation passed unanimously in the House with immediate effect on September 17, 2025.
HB 4390 expands Michigan's vehicle code to allow testing of oral fluid (such as saliva) for controlled substances, alongside blood, breath, or urine, when determining impairment. It directly affects commercial drivers who refuse chemical tests for controlled substances or alcohol while operating commercial vehicles. The bill adds a new definition of "other bodily fluid" to include oral fluid and creates a process for "preliminary oral fluid analysis" conducted by certified experts at the scene. This change updates existing suspension rules for commercial drivers who refuse testing, ensuring consistent enforcement for controlled substances alongside alcohol. The policy change specifically targets commercial motor vehicle operators who decline chemical tests for drugs or alcohol.
