What is the maximum speed when visibility on the highway is below 200 meters?
4 Answers
When visibility on the highway is below 200 meters, the maximum speed is 60 km/h. The specific details about vehicle speed under low visibility conditions are as follows: Precautions for driving on highways in foggy weather: Use vehicle lights properly. Correct use of vehicle lights is an important suggestion to ensure driving safety in foggy conditions. Drivers can use high beams as signal lights to make it easier for oncoming vehicles to spot them. During driving, frequently and gently apply the brakes. In heavy fog, frequently and gently applying the brakes helps control speed and also activates the brake lights, reminding following vehicles to maintain a safe distance. Pay attention to speed limits: When visibility is between 500–200 meters, anti-glare low beams, width markers, and tail lights must be turned on, and the speed must not exceed 80 km/h, with a following distance of at least 150 meters. When visibility is between 200–100 meters, fog lights, anti-glare low beams, width markers, and tail lights must be turned on, and the speed must not exceed 60 km/h, with a following distance of at least 100 meters. When visibility is between 100–50 meters, in addition to turning on the above lights, the speed must not exceed 40 km/h, with a following distance of at least 50 meters. When visibility is below 50 meters, it is considered extremely dense fog. Fog lights, anti-glare low beams, width markers, and tail lights must be turned on as required. Under the principle of ensuring safety, leave the foggy area, but the speed must not exceed 20 km/h. Alternatively, you can find the nearest service area to wait until the fog clears before continuing your journey.
I am extra cautious when encountering thick fog on the highway. Once visibility drops below 200 meters, the speed must absolutely not exceed 60 km/h, while maintaining a following distance of over 100 meters. Last time I encountered heavy fog on the G15 highway, I immediately turned on my fog lights and hazard lights, reducing my speed to 50 km/h. The most dangerous part was some drivers still daring to go over 80 km/h, making it impossible to see their taillights clearly. In such weather, you must maintain a following distance of at least three seconds from the car ahead; otherwise, sudden braking will inevitably lead to a rear-end collision. It's advisable to switch the air conditioning to defog mode, and cracking the window slightly can also prevent fogging.
As long-distance drivers know, speed limits are strictly enforced in foggy conditions. When visibility drops below 200 meters, traffic regulations mandate a maximum speed of 60 km/h, with a 100-meter safe distance from the vehicle ahead. In practice, I've even reduced to 40 km/h with hazard lights and fog lights all on. The key is to focus on the lane markings and avoid tailgating. Last year, my colleague rear-ended a guardrail in dense fog because he was following too closely - the front of his car was completely destroyed, and he was nearly killed. In such weather, it's better to arrive late than to rush.
I have a simple trick for driving in fog: counting lane markings! On highways, each white line segment is 15 meters long. With 200 meters visibility, you can see about 13 white lines. At this point, you must reduce speed to under 60 km/h and maintain a following distance of over 100 meters. Remember to turn on both front and rear fog lights, but avoid high beams as they cause glare. When encountering patchy fog, ease off the accelerator and never slam on the brakes. I always keep defogger spray in my car for the windshield - it's more convenient than opening windows.
