The Post has the full list of the vehicles, and says that the new HOV-friendly vehicles need to be both low-emission and energy efficient. Energy efficient is defined as being a CNG vehicle or a hybrid that gets at least 25 percent better combined MPG rate (or 50 percent in the city). Low-emission means less than 0.07 grams of nitrogen oxide per mile. Congress passed a law in 2005 allowing fuel-efficient vehicles to use HOV lanes even if there's only single driver and asked the EPA to define eligible hybrids.
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