Any ordinary car headlights works well when we travel in summer nights. We have a clear view of the road ahead and we can drive smoothly.
But what happens in winter nights, when the thick dense fog surrounds the whole city.
Ordinary headlights fails !!!
We are not able to see road ahead. What we see is the thick dense fog.
This is because, in winters our car headlights instead of penetrating the fog and striking the road, scatters. As a result we are not able to see the road.
How to deal with Fogging problem?
To deal with the problem of light scattering due to for we can do two things.
First: Remove fog from the road.
Second: Have the lights which can bypass the fog.
Clearly, going with first option is impossible.
Now the only option left is the second one.
And Thank God, We have fog lights for that.
What is Fog Light
Fog lights are specially designed lights, which when placed at right place in our car can solve our problem of driving in fog.
How fog lights work?
Any ordinary headlights are placed above in front of our car bonnet, But fog lights are placed below them with minimum distance from ground.
How it helps?
Fog generally hovers generally 12-18 inches above the ground. Fog lights use this distance to get us through the fog.
Unlike main headlights fog light use these 12-18 inches to throw light on the road. Since fog is above this height so light does not scatters and driver drives smoothly.
However even using best quality of fog lights do not mean that you will be running the car at full speeds in the road.
Fog lights are both placed in most of the cars in front as well as rear of the car (known as rear fog light). The purpose of rear fog light is to make the driver of back car aware of our car, so that he does not strikes us from back.
There are various types of fog lights are present in the market like halogen bulbs, LED bulbs, or Xenon (HID) lights.
Attribution: Andrea Pavanello [CC BY-SA 3.0 it (https://creativecommons.org/licenses/by-sa/3.0/it/deed.en)], from Wikimedia Commons [Date: 09-12-2018]