Is the maximum speed 20 or 30 when visibility is 50 meters?

[DelEmilia]

When visibility is less than 50 meters, the maximum speed is 20 km/h; when visibility is less than 100 meters, the maximum speed is 40 km/h with a following distance of 50 meters. The following are relevant regulations: Implementation Regulations of the Road Traffic Safety Law of the People's Republic of China: Article 81 When motor vehicles are driving on highways and encounter low visibility weather conditions such as fog, rain, snow, dust, or hail, if the visibility is less than 50 meters, fog lights, low beams, marker lights, front and rear position lights, and hazard warning flashers should be turned on. The speed must not exceed 20 km/h, and the vehicle should exit the highway at the nearest exit as soon as possible.

[OMarley]

With over 30 years of driving experience, I've encountered many foggy days where visibility drops to 50 meters. That's when you need to reduce your speed to the absolute minimum. Never exceed 20 kilometers per hour—20 is my safety threshold. 30 is too fast; with such limited visibility, a sudden brake ahead could be disastrous. The braking distance at 20 km/h is about 5 meters on dry roads, and doubles on wet surfaces. With 50 meters of visibility, you barely have enough space to stop. Experienced drivers know to slow down and turn on hazard lights to stay aware of their surroundings. Slippery roads require extra caution, especially with worn-out tire treads, which increase risks. I regularly check my tires to ensure good traction. Safety always comes first—keeping it at 20 km/h ensures my family arrives home safely.

[LaKeegan]

As a traffic safety enthusiast, I must say that when visibility is 50 meters, strictly maintaining a speed between 20-30 km/h is safe. 30 is the upper limit, but 20 is more secure because human reaction time requires 0.5 seconds, and short visibility increases accident risks. Regulations suggest a speed limit of 20-30 km/h when visibility drops below 50 meters, with 20 being the minimum on slippery roads. Based on my analysis of accident data, slower speeds can reduce risks by 70%. Additional tips: turn off cruise control to stay focused, always use fog lights at night. Maintain a large following distance—at least 10 meters of safe spacing for 50-meter visibility. At 20 km/h, effective braking can prevent chain collisions.

[DiRuth]

From a daily driving perspective, I firmly maintain 20 km/h when visibility is 50 meters. 30 km/h is unreliable—during my first drive in heavy fog, I almost rear-ended someone. A 50-meter visibility equals the maximum safe distance ahead, making it hard to spot sudden hazards at higher speeds. I recommend a steady 20 km/h with hazard lights for better visibility. Don’t forget to clean headlight covers, as dust worsens illumination in fog. New drivers, remember: slower speed means lower risk, and increasing following distance is crucial. Always carry a reflective vest for emergencies—simple safety habits save lives.