What does the driverless car of the future smell like inside? An aromatic mixture of hard drive, laptop, GPS and sandwich, according to financial institution Ally. Ally’s booth at the North American International Auto Show in Detroit offered a “New Car Smell” exhibit—encouraging visitors to imagine how the cars of the future might smell. “Our New Car Smell exhibit was such a hit at NAIAS last year that we decided to add two new smells to the lineup this year that riff on current auto industry...