http://74.125.95.101/translate_c?hl=en&sl=pt&u=http://autozine.com.br/diversos/uma-lombada-que-premia-quem-anda-devagar&prev=/search%3Fq%3Dhttp://autozine.com.br/%26hl%3Den%26rls%3Dcom.microsoft:en-us%26sa%3DG&usg=ALkJrhgyFyvh1DMTaeQiNigk7Bli89C7Xw"Designers & Jae-yun Kim Jong-Su Lee say it's time to move on! No more of this silly giant bumps in the road when we could advance! So what do they do?
They make a speed bump that’s based on retractors that open if the impact with them is small enough. These speed bumps can be configured so that if a car is going below 30km/h, the speed bump flattens; over 30km/h, the force causes the retractor to stay closed, keeping the speed bump active. "
