translation.en: Now, you may remember me asking the question as well, a very interesting observation, that actually those strange little signs that actually flash "35" at you, occasionally accompanying a little smiley face or a frown, according to whether you're within or outside the speed limit -- those are actually more effective at preventing road accidents than speed cameras, which come with the actual threat of real punishment.
translation.zh: 你大概也记得我的另一个问题 一个很有趣的观察 那些公路上奇怪的小标示牌 持续闪烁着“35“ 偶尔伴随着一个笑脸 或者愁脸 取决于你是否超速 它们其实比测速机 更有效地预防了车祸的发生 尽管后者以实施惩罚 来警戒驾驶人