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Hybrid cars may get OK to use high-occupancy lane

State officials are considering allowing solo drivers of hybrid cars to use high-occupancy vehicle lanes normally reserved during rush hour for vehicles carrying at least two people.

The goal is to encourage more people to buy the low-polluting, fuel-stingy gas-electric cars. Arizona, California, and Virginia already have similar policies, though only Virginia allows hybrids in high-occupancy lanes.

The Massachusetts policy, under discussion by officials of the Commonwealth's transportation and environmental agencies, would apply to the movable six-mile zipper lane on the Southeast Expressway during morning and evening rush hour, and the 2-mile high-occupancy lane on Interstate 93 southbound from Somerville to the Leonard P. Zakim Bunker Hill Bridge.

The high-occupancy lanes, as well as new two-person-minimum lanes that are part of the Big Dig roadway network, are usually wide open during rush hour and cut commuting time dramatically, while other travel lanes are typically bumper to bumper.

"No decision has been made, but the idea of providing an incentive for the purchase of clean vehicles is a very attractive one, especially as more choices become available to consumers," said Philip Hailer, spokesman for the Office of Commonwealth Development, which oversees transportation and environmental affairs.

According to industry estimates, 250,000 hybrid vehicles are on US roads today, including popular models such as the Prius, which Toyota says gets 48 miles a gallon. American and foreign manufacturers are rolling out many different models, including sport utility vehicles and pickup trucks, over the next several years. By 2010, 50 hybrid models are expected. The vehicles use a combination of electric power and gasoline, and most recharge automatically.

The move would be the latest environmentally friendly initiative by the Romney administration, which two years ago promised to get rid of most sport utility vehicles in the state fleet. While campaigning, Governor Mitt Romney also suggested charging higher registration fees for cars with low gasoline mileage, though that idea has not been put into effect.

"Anything we can do to reduce air pollution by encouraging the use of more fuel-efficient vehicles is a good thing," said Jeremy Marin, spokesman for the Massachusetts chapter of the Sierra Club. He said the state could also provide tax incentives for buying hybrid vehicles, as the US government does.

But allowing solo drivers of hybrid vehicles into high-occupancy lanes has not gone entirely smoothly where it has been tried.

In California and Virginia, many commuters complained that the hybrid vehicles were wildly popular and that people needed no further incentive to buy them. A Virginia task force found recently that the hybrid vehicles were clogging high-occupancy lanes.

In California, some car makers balked when the state wanted to limit high-occupancy access to hybrid vehicles with fuel efficiency of 45 miles a gallon or better, which excluded some models, such as the Ford Escape sport utility vehicle.

"That led to a lot of confusion," said Elroy Garcia, spokesman for the Alliance of Automobile Manufacturers. "It was limiting hybrids at a time when manufacturers are expanding the hybrid options for consumers."

There is also the matter of federal approval for such policies, which has not yet been granted by Congress. A standard rule, which would become part of Federal Highway Administration guidelines, has been suggested in different bills, including an energy bill last year and the transportation reauthorization bill, which continues to languish.

The policy is on hold in California and Arizona. In Virginia, solo drivers of hybrid cars are permitted to use the high-occupancy lanes even without federal approval.

Massachusetts would wait until a national policy is set before opening the high-occupancy lanes to hybrid owners, state officials say. In addition, the state would have to distribute markings for the vehicles that are easily identified by the state troopers stationed to monitor the lanes.

Anthony Flint can be reached at flint@globe.com.

Pop-up GLOBE GRAPHIC: Hybrid cars on the road
2005 Prius, a hybrid that Toyota says gets up to 48 miles a gallon.
2005 Prius, a hybrid that Toyota says gets up to 48 miles a gallon.
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