A traffic jam of Silicon Valley companies has a mission: to destroy Detroit’s business model and take over transportation with driverless cars and shared mobility services. Yet last summer, General Motors’ top brass ventured behind enemy lines to meet with the very forces trying to upend the industry. When the 15 executives returned to Detroit, they realized they needed to defend their turf not only by accelerating their own mobility programs—from ridesharing outfits to driverless-car software—but also by forming alliances with the challengers in the Valley.

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