by 
The Curious Bag
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You've probably driven through really thick fog or during a downpour before and had difficulty seeing even a few feet in front of you. Driving like this can be dangerous, so car manufacturers began installing fog lights onto vehicles, which allow you to see better in low visibility conditions.
Function
Fog lights serve to help drivers see in poor conditions when regular headlights are not effective enough.
Identification
The size and shape of fog lights vary from vehicle to vehicle, but, if you have them, they are located underneath your automobile's headlights.
Effects
Fog lights create a beam of light that helps your visual spectrum when traveling in poor weather conditions by reducing glare, according to Daniel Stern Lighting. They illuminate objects in your peripheral vision, so you can better see the edge of the road and the lines dividing lanes.
Considerations
Not all vehicles come standard with fog lights. For the most part, those that do come with fog lights installed are of poor quality, according to Daniel Stern Lighting; therefore, many drivers opt for aftermarket fog lights instead.
Warning
Fog lights may blind oncoming traffic, so only use your fog lights when necessary.
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