In 2009, Solar Roadways received a $100,000 Small Business Innovation Research (SBIR) grant from the United States Department of Transportation (USDOT) for Phase I to determine the feasibility of the proposed project.[5] In 2011, Solar Roadways received $750,000 SBIR grant from the DOT for Phase II to develop and build a solar parking lot;[6] from this, they built a 12-by-36-foot (3.7 by 11.0 m) parking lot covered with hexagonal glass-covered solar panels sitting on top of a concrete base, heated to prevent snow and ice accumulation, with LEDs to illuminate road lines and display messages. According to the Brusaws, the panels can sustain a 250,000 lb (110,000 kg) load.[7]