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. 9-03.21 explains specifications on using Recycled Materials, and glass is addressed in "9-03.21(1)D Recycled Glass" (glass cullet).
There is also a chart "9-03.21(1)F Table on Maximum Allowable percent (By Weight) of Recycled Materials" explaining public projects and to what percentage these materials must be mixed with raw materials.
See the link below for a full WSDOT document.