Some companies integrate polystyrene beads into concrete blocks, while some make concrete blocks that accommodate rigid foam inserts. Energy efficiency and on-highway general performance are central to the way forward for transportation as well as the clean energy changeover. The U.S. Division of Energy Countrywide Renewable Energy Laboratory's (NREL's) modeling https://freeecogrants.co.uk/4-reasons-to-apply-for-the-eco-grants/