The Traffic Barrier-Transfer Machine Caltrans is studying the durability and performance of its Barrier-Transfer Machines, also known as “zippers.” Facebook Prev Article Next Article Engineering Checkout these cool gadgets... Related Posts Hubble Memorable Moments: Tinkertoy Solution Transportation of the Future – Building the Hyperloop Can Underwater Turbines Solve Our Energy Problems? Engineers vs. Machinists – Miracle Spinning Tops How the SR-71 Blackbird’s Engines Work Aboard One of the Biggest Container Ships in the World