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Your driving-directions app that bosses you around like a back-seat driver is squeezing the life out of Loyd Sigmon’s name and his namesake baby: the SigAlert.

“It’s literally a back-seat driver.”

Mr. Massie said he has little faith in an automated back-seat driver that has the power to shut down a car.

But Williams was not made to be a back-seat driver and, desperate for independence, he severed ties with the Canadian businessman.

Even as president, Mr. Trump has often appeared most comfortable in the role of back-seat driver, jeering his own government like a common bystander, insisting that someone really ought to do something about all this.