Hit the forbidden Start button at 70 mph? Here's what your car does next

Curiosity about the push-button ignition can lead to dangerous situations. A light touch on the start/stop button while driving is usually ignored by modern cars. However, holding it down can shut off the engine, disabling power steering and brakes. Some cars, like BMW, react to quick taps. This feature is a safety override for emergencies, not for casual use.