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 The Largest Spiral Escalator Ever Built Just Opened In Shanghai Turning Shipping Containers into Water Purifying Centers From New York to London by Car – Crazy Mega Project Dawn Of A New Era: The Revolutionary Ion Engine That Took Spacecraft To Ceres ‘Zipper’ truck builds tunnels What Are the Chinese Building Underground in Hainan?