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Choke point

The Ambassador Bridge that links Detroit and Windsor, Ontario, is a main artery for auto parts flowing between the United States and Canada.

But in the aftermath of terrorist attacks last week, traffic backed up for miles across the bridge as U.S. Customs officials tightened security measures.

Some trucks waited in line for 12 hours or more, before being allowed to cross the border. As a result, production was disrupted at some assembly plants that ran out of parts.



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