Polyurea on sound barrier walls effectively reduces highway noise pollution, with government agencies (FHWA, NHTSA), research institutions (universities, ASHE, ITE), and industry partners (Carlisle SynTec, Trelleborg) playing crucial roles in standardization, funding, design, and manufacturing. EPA ensures environmental regulations, while NHTSA prioritizes road safety through noise reduction. Ongoing research and industry advancements enhance sound barrier effectiveness.