The query refers to a road rehabilitation project on Highway 20 in California that utilized the Wirtgen WR 2500 cold recycler machine for a cold foam in-place recycling application. The "WR 2500" is the model number of the machinery used, not a formal project name itself. This project was a demonstration or a specific job that showcased the cold recycling technology using foamed bitumen as a binding agent. This method allows for the damaged pavement to be granulated, mixed with a binding agent on-site, and immediately re-laid as a new, durable base layer, which significantly reduces construction time and material transport.

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