What Lights to Turn on When Driving in Foggy Weather?

[McJanelle]

When driving in foggy weather, turn on the fog lights, tail lights, marker lights, and low beams. In heavy fog, the visibility of the road ahead is low, severely affecting the driver's field of vision and making it difficult to judge the distance of vehicles ahead. Therefore, it is essential to promptly activate the fog lights to alert following vehicles and prevent accidents. On motor vehicles, the front fog lights are yellow, while the rear fog lights are red. Due to their high brightness and strong penetration, fog lights do not scatter light due to fog, so proper use can help prevent accidents. When driving in fog, pay attention to the following: 1. When visibility is less than 200 meters, the speed should not exceed 60 kilometers per hour, and maintain a distance of more than 100 meters from the vehicle in front in the same lane; 2. When visibility is less than 100 meters, the speed should not exceed 40 kilometers per hour, and maintain a distance of more than 50 meters from the vehicle in front in the same lane.

[Wilma]

Every time I drive out in foggy weather, I realize how crucial light selection is. Front and rear fog lights are a must—yellow light has strong penetration, making you noticeable to other drivers from afar. Low beams should also be turned on simultaneously, as they provide basic illumination. Never use high beams—the water vapor reflects the intense light, creating a blinding whiteout! If visibility drops below 50 meters, I turn on the hazard lights and slow down to under 30 km/h. Last winter, I safely navigated thick fog on the highway using this combination. Also, remember to turn on the air conditioning to defog the windows and wipe them clean if they get dirty. In foggy conditions, driving slow is far more important than driving fast.

[LaQuinn]

Using lights in fog requires understanding the science behind it. Water vapor particles scatter light, making ordinary white light less penetrating. Front fog lights are positioned low, closer to the ground where fog is thinner, and their yellow light wavelength is ideal for penetration. Rear fog lights are bright red and clearly visible from over 150 meters away. My routine is to turn on the low beams first for basic illumination, then press the fog light button. High beams are a definite no-go—the scattered light can turn you into a 'blind' driver. Once on a mountain road in thick fog, I turned on the rear fog light, and the driver behind me honked in gratitude. A reminder: check if your fog light bulbs are working properly and clean the lamp covers while you're at it, as dust also affects light penetration.

[VanEverly]

Novice drivers often ask me how to use lights in foggy conditions. Remember this rhyme: 'Low beams, front fog lights, rear fog lights—no high beams or hazard lights.' After starting the car, first turn on the low beams, then locate the fog light symbol button on the dashboard—front and rear fog lights are controlled separately. In heavy fog, the rear fog light is especially crucial, with three times the penetration power of brake lights. Hazard lights? Only for extreme situations, like visibility under 10 meters. Important reminder: Clean the front and rear windshields before setting off, and use the car's external air circulation to defog. Maintain a safe distance—sudden braking in foggy conditions increases the risk of rear-end collisions.

[MarianaAnn]

Having worked as a driving instructor for ten years, I repeatedly emphasize the lighting regulations for foggy conditions. The law requires the use of low beams and front fog lights, with rear fog lights additionally mandatory on highways. Look for the button with a wavy line on the dashboard. It's crucial to highlight the prohibition of high beams—their light scatters in fog, reducing your own visibility while dazzling oncoming drivers. In extremely dense fog, experienced drivers turn on hazard lights to alert vehicles ahead and behind, but remember to turn them off before turning to avoid misleading others about your direction. Lastly, ensure your wipers work with windshield washer fluid—impaired visibility is more dangerous than lighting malfunctions.

[ArcherDella]

Yesterday, while driving my child to school in heavy fog, I personally tested the lighting combinations. I turned on the low beams as soon as I started the car, then pressed the front fog light button—the icon is a bulb with a diagonal line on the left. Avoid using the rear fog light unless visibility is extremely poor. When the rearview mirror was completely white, I turned on the hazard lights to alert vehicles behind me. The most crucial aspect is speed control—even cruising at 40 km/h felt too fast. I recommend testing your fog lights before driving in foggy conditions, as some owners don’t realize their bulbs are burnt out. Also, applying anti-fog treatment to the windshield helps avoid the distraction of wiping it while driving.