"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. "