CHICAGO - The battle over dueling proposals to build bridges between Detroit and Windsor, Canada, is heating up following the U.S. Department of Transportation's recent approval of nearly $800 million in private-activity, tax-exempt bonding to help finance a replacement for a developer's existing private bridge.

The approval last month to sell $787 million of debt came a week after the DOT gave final environmental approval for a competing plan also backed by the federal government, as well as Michigan and Canada, to build a bridge less than two miles south of the privately owned Ambassador Bridge.

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