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LOS ANGELES, CA - FEBRUARY 03: Cars drive in the High Occupancy Vehicle (HOV) lane (R), also called the diamond or commuter lane, on the 118 or Ronald Reagan Freeway on February 3, 2005 near Simi Valley, California. To encourage sales of environmentally-friendly hybrid cars, lawmakers are contemplating legislation that would allow states to determine whether to allow hybrid vehicles with no additional passengers to be driven in highway HOV lanes, currently reserved only for motorcycles and vehicles carrying multiple passengers. (Photo by David McNew/Getty Images)

LOS ANGELES, CA - FEBRUARY 03:  Cars drive in the High Occupancy Vehicle (HOV) lane (R), also called the diamond or commuter lane, on the 118 or Ronald Reagan Freeway on February 3, 2005 near Simi Valley, California. To encourage sales of environmentally-friendly hybrid cars, lawmakers are contemplating legislation that would allow states to determine whether to allow hybrid vehicles with no additional passengers to be driven in highway HOV lanes, currently reserved only for motorcycles and vehicles carrying multiple passengers.  (Photo by David McNew/Getty Images)