From the dangers to the technology designed for prevention, an article from Consumer Reports examines the issue of drowsy driving.

Entrepreneurs have introduced stay-awake gadgets, including an ear device that sounds off if your head nods forward and smartphone apps that randomly blast an alarm. But such devices may only be providing a false sense of security.

Certain cars can now detect driving patterns that suggest drowsiness, such as lane drifting. But what do the high-tech cars do if they think you’re getting sleepy? Mercedes CLA-Class cars turn on a coffee-cup icon and sound an alert. And the navigation system in the Volvo XC90 can direct you to a rest area.

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