One way to prevent traffic accidents is to require everyone to drive a similar car, travel at the same speed, and head in the same direction. Another is to enforce some simple rules: don’t drive in the fast lane if going slow, stop at red lights, use a signal before a turn, and so on.
我们用交通来做类比。防止交通事故的一种方式是要求所有人都开相似的车，以同样的速度行驶，并去往相同的方向。还有一种方法是执行某些简单的规则：开慢车的不要上快车道，红灯停车，转弯打灯，诸如此类。