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 design tricks that keep skyscrapers from swaying Programmable Table Why The Netherlands Isn’t Under Water Burj Khalifa – How To Build Higher Japan to Place Solar Panels on the Moon Testing Which Battery Lasts the Longest