The bill prohibits state and local governmental agencies from restricting or regulating the manufacture, sale, or use of passenger vehicle tires in Washington if those tires comply with federal motor vehicle safety standards under 49 U.S.C. §30111. It explicitly allows any person to manufacture, use, or sell such tires in the state and bars agencies from issuing rules that restrict or ban tires based on energy efficiency or rolling resistance ratings. The bill adds these prohibitions into chapters 70A.05 and 70A.45 RCW, including when those chapters are applied as part of greenhouse gas reduction strategies. The bill reenacts and amends RCW 70A.30.010 to require the Department of Ecology to adopt and amend rules to implement California motor vehicle emission standards (Title 13 CCR) and to maintain consistency with those standards and with 42 U.S.C. §7507, but it also states the department may not adopt restrictions on the manufacture, sale, or use of vehicle tires even if California regulations include such restrictions. Section 2 is declared to constitute a new chapter in Title 19 RCW. This is a mix of preemption/prohibitory provisions, a statutory amendment and reenactment, and a requirement for administrative rulemaking; the extracted text does not provide enforcement mechanisms, penalties, procedural details, statutory definitions for key terms (for example, "passenger vehicle tires" or "rolling resistance rating"), effective dates, or a specific chapter number for the new Title 19 chapter. An exemption for state residents who are members of the armed services while stationed outside the state is noted in the extracted facts.

If enacted, tire makers and retailers would gain clear statewide certainty that any passenger tire meeting federal safety standards can be produced, sold, and used across Washington, reducing the risk and cost of complying with different local rules and making it easier to offer the same products statewide. Consumers would keep a wider range of tire choices rather than facing new state or local limits tied to energy efficiency or rolling resistance. Agencies that design greenhouse gas or vehicle emission strategies would lose the option to use tire-efficiency requirements as a policy tool, even as the Department of Ecology is required to align vehicle emission rules with California standards, creating a practical constraint on some emission-reduction measures. Important implementation details—such as exact definitions of covered tires, enforcement mechanisms, penalties, and effective dates—are not provided in the extracted text, so how and when these changes would be applied is uncertain.