Many drivers are unaware of an essential function of the rearview mirror, which helps prevent glare while driving at night.

Driving after dark poses different challenges than during the day.

While traffic tends to flow more freely, visibility decreases considerably, and consequently, risks increase.

One of the most common problems is glare from other cars’ headlights, which can be dangerous for drivers.

How the Car’s Secret Button Works

To counteract this problem, most vehicles have a secret button on the rearview mirror.

This feature, which has been around for decades, reduces the glare from lights coming from behind, making nighttime driving safer.

Simply pressing a tab or lever causes the mirror to dim the incoming light.

In newer models, this system has become automatic thanks to electrochromic rearview mirrors.

These mirrors detect light intensity and, using sensors and a special coating, darken their surface to prevent glare.

When the distracting light disappears, the mirror automatically returns to its original state.

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