(CBS DETROIT) – Automakers are preparing to ramp up production ahead of the collective May 18 start date.

General Motors says three of its auto part plants are calling in workers this week.

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Skilled trade and salary workers will return to 13 of its U.S. plants including Flint next week.

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Ford’s Dearborn and Wayne plants will also open next week.

The company’s flat rock plant will open on May 25.

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