In Illinois, the use of recycled aggregate for road and other construction is highly encouraged. The state has set guidelines and standards for the use of recycled materials in infrastructure projects. These guidelines include testing, specification, and quality control measures to ensure that the recycled materials are suitable for their intended use.

Illinois also offers financial incentives for the use of recycled aggregate. For instance, the state provides grants and loans to businesses and contractors who use recycled materials in their projects. This encourages the use of recycled materials, as it reduces the cost of construction.

One of the notable initiatives in Illinois is the Illinois Department of Transportation's (IDOT) "Greenbook." The Greenbook is a set of guidelines for the use of recycled materials in transportation infrastructure projects, including roads, bridges, and airports. The Greenbook provides standard specifications and technical notes for the use of recycled materials, including aggregate, asphalt, and concrete.

Moreover, the state has collaborated with local associations and organizations to raise awareness about the benefits of using recycled materials. The Illinois Recycling Association, for instance, promotes the use of recycled materials to reduce the impact of waste on the environment. The association encourages businesses to adopt sustainable practices, including the use of recycled aggregate.

The state has also established partnerships between waste management facilities and construction companies. These partnerships enable waste management facilities to supply recycled materials to construction companies, making it easier for contractors to access recycled materials.

Finally, Illinois encourages the use of recycled aggregate for road and other construction through financial incentives, guidelines and standards, partnerships, and collaboration. The use of recycled materials not only helps reduce construction costs but also promotes sustainability and environmental protection. Therefore, encouraging the use of recycled materials in Illinois is beneficial for both the construction industry and the environment.