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Another source of feedback on program operations is performance monitoring data . Hybrid vehicles , which have more than one source of power on board , and electric vehicles have the potential to reduce greenhouse gas emissions , air pollution , and petroleum consumption . The main source of information on crime against commercial targets is the Commercial Victimisation Survey ( CVS ) . For 38.6 percent , Public Roads is the primary source of information on highway research and technology , and for 49.6 percent , it is one of three primary sources .