Final answer:
Gas stations are not considered part of the Highway Transportation System due to specific characteristics and market arrangements.
Explanation:
Gas stations are not considered part of the Highway Transportation System despite serving vehicles and providing essential fuel. They are excluded due to being viable at a small scale, not capital-intensive, and lacking strong public goods features. This is because they operate under a 'pay as you go' market arrangement, allowing market-driven development without being classified as infrastructure.
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