ORNL’s Sustainable Transportation Program performs research and development leading to new vehicle and transportation system technologies. Highway transportation—light-, medium-, and heavy-duty vehicles—accounted for ap-proximately 23% of U.S. greenhouse gas emissions and about 64% of all petroleum used in the United States in 2009. Energy use in highway transportation
is expected to increase almost 21% by 2035—from 11.1 to 13.4 million barrels per day oil equivalent2. ORNL researchers are focusing on clean, efficient, and intelligent paths to reducing transportation fuel consumption and emissions, and achieving improved energy security. The research and development portfolio includes alternative fuels, more efficient vehicle components, lightweight materials, transportation electrification, and intelligent transportation systems and operations.