Are automobile speedometers set accurately or just “generally”? I always assumed that a car’s speedometer accurately reflected the driving speed, assuming there is nothing wrong with the speedometer.

Apple recently revealed a new version of its CarPlay system for vehicles, which include gauges like speedometers. But even Apple, the company that cast aside tradition when it reinvented phones, music ...

The speedometer, of course, tells you how fast or slow your car is moving when you’re behind the wheel. The traditional speedometer shows a hand that raises or lowers, or swings left and right, when ...