Each highway has different speed limits, with the maximum speed limit in China not exceeding 120 kilometers per hour. China's "Regulations for the Implementation of the Road Traffic Safety Law" stipulate the highway speed limit standards: the minimum speed on highways should not be less than 60 kilometers per hour, and the maximum speed should not exceed 120 kilometers per hour, which is an internationally recognized standard. When driving on highways, it is important to pay attention to the speed and avoid going too fast. Reasons for the 120km/h speed limit on highways: 1. Road factors: The 120km/h limit is set based on China's road design standards. The road surface friction coefficient, guardrail strength, lane width, slope, curvature radius, and sign size are all designed according to the 120km/h standard. If the speed limit is arbitrarily increased, all related designs would need to be revised, and existing highways would require reconstruction, which would be extremely costly. 2. Driver factors: The driver's vision, field of view, and reaction time are the three most critical elements affecting traffic safety. Generally, as speed increases, a person's field of view and vision deteriorate. 3. Vehicle factors: Vehicles can handle 120km/h without any issues. In the event of a tire blowout at this speed, there is still a chance of survival. However, at speeds of 200km/h, the chance of survival is virtually zero. 4. Environmental factors: Environmental factors include various aspects, such as adverse weather conditions, poor road conditions, diverse vehicle types, overall poor vehicle conditions, speeding, fatigue driving, and overloading. When encountering adverse weather conditions like rain, snow, fog, or ice, the safety coefficient of road travel significantly decreases, requiring drivers to proactively reduce speed to ensure safety.
