Transportation (Roads & Highways)

SB 457, the Oklahoma Diesel Engine Freedom Act, invalidates federal rules requiring diesel exhaust fluid (DEF) in diesel engines used within Oklahoma, declaring such requirements unconstitutional under the 10th Amendment. It prohibits state agencies and officials from enforcing federal DEF mandates and legalizes the sale and use of diesel engines that do not require DEF in the state. The bill imposes fines up to $5,000 per violation for state entities enforcing federal rules and repeals an existing Oklahoma emission control law. It applies only to vehicles operating solely within Oklahoma, not to interstate commerce.

HB 3665 prohibits the use of motorized vessels with engines over 10 horsepower on the Lower Mountain Fork River between the dam and Wild Goose Road. This law directly affects recreational boaters and river users in that specific section, effective November 1, 2026. Exceptions include law enforcement, emergency services, government operations, and vessels protected by federal law or tribal treaty rights. The bill aims to regulate motorized activity in this river segment without restricting authorized public safety or governmental use.

SB 2078, the Oklahoma Diesel Engine Freedom Act, declares federal mandates requiring diesel exhaust fluid for vehicles operating solely within Oklahoma void, asserting the state's authority under the 10th Amendment to regulate intrastate emissions. It allows the manufacture, sale, and use of diesel engines not requiring exhaust fluid within Oklahoma, prohibits state agencies from enforcing federal diesel fluid requirements, and imposes fines up to $2,500 for violations. The bill repeals an existing Oklahoma statute (47 O.S. 2021, Section 12-423) related to emission control systems. It applies specifically to vehicles engaged only in intrastate commerce, not interstate travel.

HB 1348 repeals Sections 1930, 1931, and 1932 of the Oklahoma Statutes (69 O.S. 2021), which established the Oklahoma Road User Charge Program. This bill directly ends the state's road user fee program, which charged drivers based on vehicle miles traveled. The repeal takes effect on November 1, 2025, eliminating this specific funding mechanism for transportation. The bill does not create new policies or affect other transportation programs.