Method to prevent vehicles from passing a temporarily speed reduced part of a road with high speed, and a device for utilizing the method

Abstract From the Canadian patent

The present invention provides apparatus for laying on a road surface to induce a vehicle driver to reduce speed comprising a first elongated mat element for creating a relatively low bumping frequency in a vehicle when passing over said first element and a second elongated mat element for creating a relatively high bumping frequency in the vehicle when passing over said second element, said first element including a road contact surface and a series of substantially trapezium section substantially parallel transverse beam elements on an upper surface of said first element opposite said road contact surface each trapezium section beam element having a top surface substantially parallel to …