SAN FRANCISCO - Facing rising interest costs triggered by downgrades to Ambac Assurance Corp., the Orange County Transportation Authority is moving forward with plans to refinance toll revenue bonds it issued in 2003 to acquire toll lanes on the State Route 91 freeway from private owners.

The original bond issue included $95.3 million of fixed-rate bonds and $100 million of variable-rate demand bonds, all insured by Ambac.

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