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 Modular Sprite drone is shaped like a thermos for better portability Turning Shipping Containers into Water Purifying Centers How a Tugboat Works What If We Make A Tunnel Under The Ocean? This Concrete/Asphalt Absorbs Water Like Magic Burj Khalifa – How To Build Higher