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Traffic congestion on Front Street , in the financial district of San Francisco, Calif.,...

Adolfo Cabral lived and worked much of his life in San Francisco until housing prices forced him a decade ago to move across the Bay to western Berkeley. He's not happy San Francisco is considering a plan to charge him — and thousands of other commuters — a fee to drive into the city's most congested downtown areas during rush hours.

"San Francisco's housing prices chased me out of town," said Cabral, who drives in a car pool to a job in the financial district. "Now, they want to tax me for driving back in. I don't like the idea of government sticking their hands in our pockets every time they need a solution to a problem caused by poor planning."

To fight gridlock, smog and global-warming gases, San Francisco is considering becoming the first city in the nation to impose congestion-management fees during rush hour to drive into and possibly out of the busiest downtown areas.

Fees from $1 to $4 are being examined in an 18-month study of congestion pricing by the San Francisco County Transportation Authority, an agency governed by the San Francisco Board of Supervisors. The money would be invested in public transit and other congestion-reducing measures.

"We're trying to manage a scarce resource, our roads," said Tilly Chang, the transportation authority's deputy director for planning. "There are power and gas rates that also put a premium price on use during peak demand. Why not roads, too?"

Congestion fees for