A Washington State University researcher has developed an asphalt, derived from restaurant waste cooking oil, that could slash the cost to less than $200 per ton. The price of conventional asphalt, made of residues from the production of gasoline and other materials, has increased to as much as $800 per ton because of environmental regulations and the rising cost of petroleum. The bio-asphalt looks and performs like conventional asphalt and will be put to the test on a trial road this year.

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