There is all sorts of information in the Washington State Department of Transportation: Standard Specifications for Road, Bridge, and Municipal Construction 2021, but you may have to dig to find information on using recycled glass. Division 9-Materials outlines material requirements. More specifically part 9-03.21 explains specifications on using Recycled Materials, including glass.
You will see a chart on page 9-40 that shows glass acceptance standards in public projects and to what percentage it can be mixed with raw materials. See the link below for a full WSDOT document.