Developers of a trial using nappies to make roads say it could mean the surfaces last twice as long.
The project is being piloted in Wales, and it could mean fewer nappies are thrown into landfill.
Fibre from nappies is added to bitumen glueing together asphalt road surfaces.
The Welsh government is backing the project with £180,000 funding, and a stretch of the A487 between Aberystwyth and Cardigan in Ceredigion has already been replaced with the nappy formula.
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