CHICAGO - Even as rising gas costs threaten Michigan's transportation revenues, the state needs to double spending on its roads and bridges or up to 30% of roads will become unsafe within the next decade, according to a report on the state's transportation system released this week.

The report comes as a task force appointed by Gov. Jennifer Granholm explores alternative ways to fund the state's transportation system, including leasing sections of public roads to private companies to generate up-front cash payments, said one member of the task force subcommittee.

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