Before 1997, only foreign companies produced and sold rubber speed humps equipped with reflective beads. It also has a nickname abroad, “the lying policeman,” which means that vehicles will slow down as they see the police when passing it. At that time, domestic speed humps were mainly made of cement and cast iron. However, rubber speed hump has a high ability of flexibility and shock-absorbing, and the feeling of turbulence is not strong when cars move on it. It is eye-catching to see...