It could be a defining element of CEO Mary Barra's legacy at General Motors: A drastic shift over the next 10 years from 26 global vehicle production platforms to just four by 2025, a bold stroke that could eventually save the U.S. automaker many billions of dollars in production costs.The radical streamlining of GM's basic architectures, announced on Wednesday at a day-long investor briefing near Detroit, is intended to simplify the engineering and manufacturing of GM's future cars and trucks, while enabling the company to deliver better-differentiated designs more quickly to customers around the world.
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