How we pick speed limits？🔜

1. How did they decide on those numbers? Well, firstly, exceeding the speed limit or driving too fast for the conditions is the primary cause of auto crashes globally, which is why we have speed limits in the first place. Because speed limits are determined by data, but the data is from three main things:nature, engineering, and humans. 2. For example, when highway andtraffic researchers decide a speedlimit, they take into account the weather, visibility, terrain, the location of the road and so on - that’s the nature. 3. They also take into account the purpose of the road, crash risks, traffic and truck flow monitors, what the road is made of, the amount of shoulder next to the road, maintenance schedules - that’s the engineering. 4. The human component has a lot to do with safety, but also our ability to actually drive on the roadat that speed. So, nature, engineering and humans together (are) factored in to how we pick speed limits. 他们是如何决定这些数字的？首先，超过限速或相对实际条件开得太快是全球车祸的主要原因，这就是我们最初设置限速的缘由。因为速度限制是由数据决定的，但这些数据主要来自三个方面：自然因素、工程因素和人为因素。 例如，当公路和交通研究人员确定一个限速时，他们会考虑到天气、能见度、地形、道路的位置等等，这就是自然因素。 他们还考虑到道路的用途、车祸隐患、交通和卡车流量监测、道路的材质、道路旁边的路肩数量、维护安排——这就是工程因素。 人为因素与安全有很大关系，但也与我们以这种速度在道路上实际驾驶的能力有关。因此，在选择速度限制时，自然因素、工程因素和人为因素要一起被考虑到。