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Secretary of Transportation

The head of the U.S. Department of Transportation, a cabinet-level position responsible for overseeing federal transportation policy.

Composite materials

Materials made from two or more different materials which, when combined, create a material with properties superior to those of the individual components, often used for strength and lightness (e.g., fiberglass, carbon fiber).

Hydrogen

A colorless, odorless gas that is the lightest chemical element. It is considered a clean energy source when produced renewably, as it only produces water when burned or used in a fuel cell.

Natural gas

A naturally occurring hydrocarbon gas mixture consisting primarily of methane, often used as a fuel.

Rulemaking

The process by which federal agencies create, amend, or repeal rules or regulations. This typically involves public notice, comment periods, and review before a rule becomes legally binding.

Consensus standards

Technical standards developed and agreed upon by a broad group of stakeholders (e.g., industry, government, consumers, academics) through a formal process, often used to ensure safety, quality, or interoperability.