What is the speed limit when visibility is less than 100 meters?

[OGrace]

When visibility is less than 100 meters, the vehicle speed must not exceed 40 kilometers per hour, and a distance of more than 50 meters should be maintained from the vehicle ahead. Turn on the fog lights, low beam lights, position lights, and front and rear position lights. When motor vehicles are driving on the road and encounter low-visibility weather conditions such as fog, rain, snow, dust, or hail, the road management department should issue speed limits, safe distance reminders, and other information through displays. A safe distance refers to the necessary gap that a following vehicle maintains from the vehicle ahead to avoid accidental collisions. When driving on the road under low-visibility weather conditions such as fog, rain, snow, dust, or hail, the following regulations must be observed: When visibility is less than 500 meters but greater than 200 meters, the low beam lights, width indicator lights, and rear fog lights must be turned on; the speed must not exceed 80 km/h; maintain a driving distance of more than 150 meters. When visibility is less than 100 meters, turn on the fog lights, low beam lights, position lights, front and rear position lights, and hazard warning flashers. The speed must not exceed 40 kilometers per hour, and a distance of more than 50 meters should be maintained from the vehicle ahead in the same lane. When visibility is less than 50 meters, turn on the fog lights, low beam lights, position lights, front and rear position lights, and hazard warning flashers. The speed must not exceed 20 kilometers per hour. If on a highway, exit at the nearest exit as soon as possible. Precautions for driving in foggy conditions: Make good use of lights. When driving in foggy conditions with low visibility, fog lights and position lights must be turned on, and high beams are prohibited. High beams shine upward, and the light is diffusely reflected by the fog, creating a white haze in front of the car, which affects driving. Fog lights have high light penetration, and turning them on makes the vehicle clearly visible to others. Maintain a safe distance from the vehicle ahead. Do not follow too closely, and avoid unnecessary overtaking. This prevents insufficient reaction time in case of an accident, which could lead to rear-end collisions. Frequently use the horn to indicate your position.

[LaRichard]

I remember the first time I drove in thick fog, visibility was less than 100 meters, and the road was completely white, making it impossible to see distant vehicles clearly. At that time, the speed had to be kept under 40 kilometers per hour, which is a basic safety rule. Under such conditions, the range of vision is short, and reaction time is extremely limited. Once, I wasn’t paying attention and drove a bit faster, almost rear-ending the car in front—fortunately, I braked in time. Since then, I always remind myself to slow down below 40 in foggy conditions, not just for my own safety but also to avoid causing trouble for others. It’s best to turn on the fog lights, maintain a safe distance, and not take risks just to save time. These experiences have made me appreciate safe driving habits even more, and developing a routine of regular vehicle checks can reduce the risk of accidents. In bad weather, patience is the greatest safeguard—don’t let impulsiveness affect your judgment.

[DelSawyer]

From my study of driving regulations, when visibility is below 100 meters, the speed should be maintained below 40 kilometers per hour. This standard is based on braking distance calculations. For example, on dry road surfaces, decelerating from 40 to zero requires about 20 meters, but poor visibility may only allow seeing objects tens of meters ahead. Speeding not only risks fines and penalty points but also significantly increases the probability of accidents. I recommend drivers familiarize themselves with the warning light settings on the vehicle dashboard in advance. Systems like ABS or traction control have limited effectiveness in low visibility and are more prone to malfunction. It's advisable to develop a habit of driving at low speeds, using mobile navigation to alert to weather changes, and pulling over in emergencies rather than pushing through. These details help balance safety and efficiency.

[SanChristian]

When driving in heavy fog with visibility reduced to just a few dozen meters, I always slow down to below 40 km/h. This simple rule has saved me multiple times - higher speeds increase braking distance and raise accident risks. I remember one highway trip with dense fog where maintaining around 35 km/h got me home safely. Pro tip: Avoid high beams as they cause glare; use low beams with fog lights instead, while keeping greater following distance. This technique is especially valuable for novice drivers to enhance road confidence.

[JustinAnn]

As a driver who frequently travels with family, I pay close attention to speed limits in foggy conditions. When visibility drops below 100 meters, the maximum speed should not exceed 40 kilometers per hour—this rule provides strong protection. Once during heavy rain and dense fog, I maintained a steady 35 km/h, avoiding a potential minor collision. It's crucial to keep a safe distance of at least 50 meters; otherwise, emergency braking becomes difficult. I always teach my children to sit properly in the car and stay calm in emergencies. I also regularly check tire wear to improve traction in rainy conditions. In short, driving slowly is a responsible attitude towards oneself and others.

[IsabelaAnn]

When discussing driving safety on social media, I'm often asked about speed limits in low visibility conditions. Experience tells me that when visibility drops below 100 meters, you should reduce speed to under 40 km/h. The reason is obvious: limited vision in heavy fog means slower reaction times are crucial. I recommend adjusting speed according to conditions - for example, going even slower in rain or snow. Equip your vehicle with a dashcam; it can replay accidents and help learn from mistakes. Develop the habit of anticipating hazards and slowing down proactively rather than reacting passively. These small actions accumulate into a stronghold of safety.