President Obama has directed the National Highway Traffic Safety Administration along with the US Environmental Protection Agency to begin developing the next phase of fuel efficiency and greenhouse gas standards for medium- and heavy-duty vehicles. The proposed standard is due in March 2015, while the final rule is due March 2016, according to a Feb. 18 White House statement. A previous Obama administration standard imposed the first-ever standards for medium- and heavy-duty vehicles, implemented on model years 2014 through 2018.
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