Under that standard, the Toyota Prius and Honda Insight and Civic hybrids are the only vehicles that currently qualify. As in California, interested drivers will need to get a special sticker from the state Department of Transportation. Only 10,000 vehicles will be allowed in the first phase of the program, and there are currently 9,000 eligible vehicles registered in Arizona. While hybrid drivers get to move into the car-pool lanes, drivers of bi-fuel vehicles will have to move back to the regular lanes. These are vehicles that can switch between multiple such as gasoline and natural gas.
[Source: State of Arizon via GreenCarCongress]