What is the speed limit and distance requirement when visibility is below 100 meters?
2 Answers
When visibility is below 100 meters, the speed limit is 40 kilometers per hour, and the distance between vehicles should be more than 50 meters. Additionally, fog lights, low beam headlights, outline marker lights, front and rear position lights, and hazard warning flashers should be turned on. Maintain a distance of more than 50 meters from the vehicle ahead in the same lane. When driving on highways under low visibility conditions such as fog, rain, snow, dust, or hail, highway management authorities should display speed limits and distance-keeping reminders via electronic signs. The distance a vehicle travels per unit of time is referred to as speed, commonly measured in kilometers per hour or meters per second. Vehicle speed is one of the three key parameters in traffic flow theory and holds significant importance in traffic flow studies.
When driving in fog with visibility below 100 meters, I always reduce my speed to under 50 kilometers per hour. The reason is simple: if there's a sudden obstacle or accident, this low speed gives me enough time to react and avoid a collision. The safe distance should be kept at least 100 meters or more, because I once followed too closely on the highway and almost rear-ended another car; now I deliberately increase the spacing to ensure I can stop safely. Headlights and rear fog lights must be turned on, otherwise others can't see you clearly. I always remind my friends not to rush in such weather—slow is fast, and you'll regret it if an accident happens. Checking tire pressure and the braking system is also crucial; don't let small issues ruin your safety. Life is more precious than anything else—it's better to arrive late than not at all.
