Why are the rear fog lights on many cars only lit one side?

The design of the deviation lamp comes from Europe, one side of the fog lamp and the other side for the backlight.

During a cross-country tour of the northern mountains by car, when arriving in the foggy area, the vehicles are required to turn on the fog lights both before and after. Tran Kien follows a Porsche and wonders, why does the car only shine on one side of the fog lamp and not both. Is a ball burned, or does the manufacturer forget to install a light bulb or intentionally designed it?

This is the question of many drivers, similar to the case of a rear light reflecting a white side, a red side. In fact, this is not a design error or error in the process of use, but a design tradition of many automakers around the world.

Ford Focus with a white side lamp, a red side (bottom).

Originating in Europe, where the weather is often foggy, requires cars to have warning lights at the rear, so the fog lights are born. In order for the light from this lamp to emit no lateral glare, it is a kind of monochromatic light with a large wavelength, usually red or yellow.

If the fog lights are placed in the same cluster with taillights, brake lights, brake lights, etc., when driving on the fog lights, the driver behind the car may misunderstand that the front vehicle is braking, making intermittent interruption and the driver's ability to control the vehicle later Therefore, vehicles of European origin often design fog lamps located separately below, away from taillights.

Once you have identified the location of the fog lamp, to create a balance for the rear end design, the car companies here put one side of the reversing lamp (side) and the other side of the fog lamp (driver side). Rear reversing lights help the driver clearly see the hard side. Because of this design, many vehicles in the rear see a white side (reverse light), a red side (fog lamp).

Currently, car design evolves in many trends and forms, allowing it to place lamps in many different locations, but many firms are not only European but also Asia, the US remains the same structure. Only install one side of the fog lamp. For example, the backlight is in the same taillight, the fog lamp is under the three-shock-in position of the reflector.

Subaru Forester shows one side of the rear fog lamp with a shadow (left), the other side does not.

Firms can design two fog lamps, but many firms explain a light that will give the driver more attention, but may also be a traditional design or a cost-effective way, while there are many firms that have both lights, such as Toyota.

Driving experts recommend that in countries with tropical climates like Vietnam , drivers do not need to turn on fog lights in normal conditions, even turning on this light distracts the rear car. Turn on the fog lights when entering a foggy area or it is too heavy to observe and warn other drivers.