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Most roads are made of asphalt concrete, which is a mixture of asphalt, which is a chemical compound, with gravel, which is just a bunch of little rocks. Asphalt, being a petroleum product, is probably just a hydrocarbon, meaning that the most common elements would be hydrogen and carbon.

Maybe you just want to know a compound or ingredient for roads, in which case the answer is just asphalt. If you actually care about chemical elements, then probably hydrogen is most common.

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∙ 17y ago

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