
The speed must not exceed 30 kilometers per hour. Below are the relevant details: Introduction: When driving on highways with visibility within 50 meters, the maximum speed must not exceed 30 km/h. Highway driving must strictly adhere to the principle of lane separation, with each vehicle staying in its designated lane. Crossing over lines, changing lanes indiscriminately, or riding on lane dividers is prohibited. Minimum speed regulation: The minimum speed must not be less than 60 km/h, while the maximum speed must not exceed 120 km/h. In adverse weather conditions, drivers must reduce speed according to conditions and speed limit signs. Precautions: Strictly comply with the maximum and minimum speed limits. Choose appropriate speeds based on road traffic conditions and needs. When overtaking, do not exceed the maximum speed limit, and when yielding to overtaking vehicles, do not drop below the minimum speed. Pay attention to non-standard speed limit signs on highways.

I remember driving with my family when we encountered heavy fog with visibility of only 50 meters. In such conditions, the maximum speed must not exceed 30 km/h. Why? Because I calculated the braking distance—at 40 km/h with 50 meters visibility, emergency braking might still result in a collision with the car ahead, which is extremely dangerous. I recommend turning on the fog lights, maintaining a safe distance of at least 50 meters, and slowing down mentally—don’t rush. Safety comes first; protecting our families is the most important thing.

According to traffic regulations, when visibility is less than 50 meters, the maximum speed must not exceed 30 kilometers per hour. This is clearly stipulated in China's 'Road Traffic Safety Law'. I advise all drivers to remember this rule - use fog lights and hazard warning lights in foggy conditions, and avoid overtaking. Violations may result in fines, penalty points, or even cause accidents - by then it would be too late for regrets. Driving requires strict adherence to rules, because safety is the fastest way home.

When I was taking my driving test, the instructor repeatedly emphasized that when visibility drops to 50 meters due to heavy fog, the speed should not exceed 30 km/h. I thought it was too slow at the time, but later on the highway, I experienced it once and almost rear-ended another car—it was really scary. My advice to everyone is to drive slower in fog, maintain space, and avoid sudden acceleration. Safety comes first; don't risk it just to save a few seconds.


