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 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.
HB 4391 expands Michigan's vehicle code to allow law enforcement to test for intoxication using other bodily fluids beyond blood or breath, such as urine or saliva. It directly affects drivers suspected of operating a vehicle while impaired, updating sections 625a, 625c, and 625g of the 1949 Michigan Vehicle Code (MCL 257.625a et seq.). The bill amends existing testing methods to include these additional fluids, providing more flexibility for officers during DUI investigations. The bill passed the Michigan House on July 17, 2025, with immediate effect.
HB 4426 amends Michigan's Motor Carrier Safety Act (MCL 480.12d) to set a minimum age of 21 for drivers transporting hazardous materials requiring placards under federal rules. It maintains the existing 18-year-old minimum for most commercial driving but specifically raises the age requirement for hazardous materials transport. The bill does not change medical waiver or grandfathered driver provisions. This change directly affects commercial drivers operating in Michigan who transport hazardous materials requiring placards.
HB 4203 amends Michigan's Vehicle Code to revise exemptions for tow trucks, wreckers, and road service vehicles from seasonal weight restrictions on state highways. The bill allows these vehicles to operate during restricted periods (typically winter months) when responding to emergencies or providing essential roadside assistance. This change directly affects towing and road service companies by permitting them to operate under weight limits they previously could not during certain seasons. The amendment applies specifically to vehicles performing emergency response or required road service functions.
HB 4343 exempts certain commercial trucks assisting in a declared state of emergency from Michigan's frost laws, which typically restrict truck operations during freezing conditions. This means trucks providing emergency response services (like transporting supplies or personnel) will not face traffic violations for operating during frost conditions when supporting emergency efforts. The bill amends Michigan's Vehicle Code (MCL 257.722) to create this specific exception for emergency assistance vehicles. It directly affects commercial truck operators and emergency management agencies during declared emergencies.
HB 4344 removes driving hour limits for commercial motor vehicle drivers during declared state emergencies. It specifically exempts drivers traveling to assist with or directly helping during disasters from federal hours-of-service rules (49 CFR part 395) under Michigan's Emergency Management Act. This change directly affects commercial drivers transporting goods or people in support of emergency response efforts when a state of emergency is active.
House Resolution 91 is a resolution expressing support for President Trump’s policies aimed at increasing the nation’s energy infrastructure and security. The resolution specifically highlights how these policies have facilitated emergency permitting for the Enbridge Line 5 tunnel project, intended to replace an existing pipeline under the Straits of Mackinac.
HB 4185 changes how Michigan's general sales tax revenue is distributed. It directs 15% of the 4% sales tax to cities, villages, and townships through the Glenn Steil Revenue Sharing Act. Sixty percent goes to the state school aid fund (including all 2% tax from aviation fuel sales), while 27.9% of 25% from vehicle/fuel sales funds the transportation system. Additionally, it requires $9-12 million annually from computer software sales to the Michigan health initiative fund.
