Why do hybrids qualify for the Smart Pass decal and not other low-emission vehicles?

Traditionally, only vehicles with two or more occupants have been allowed to travel in HOV lanes. In Tennessee, those lanes are in effect during morning and afternoon rush hours. On August 10, 2005, a new federal transportation act was signed into law and included an exemption from the HOV occupancy requirements for vehicles certified as low emission and energy-efficient. The new provision required the EPA to issue regulations for certifying vehicles as low emission and energy-efficient.

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