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IELTS READING PRACTICE TEST PASSAGE 1 : Keep a watchful eye on the bridges

IELTS READING PRACTICE TEST PASSAGE 1 : Keep a watchful eye on the bridges

 Keep a watchful eye on the bridges   A. Most road and rail bridges are only inspected visually, if at all. Every few months, engineers have to clamber over the structure in an attempt to find problems before the bridge shows obvious signs of damage. Technologies developed at Los Alamos National Laboratory, New Mexico, and Texas A&M University may replace these surveys with microwave sensors that constantly monitor the condition of bridges. B. ” The device uses microwaves to measure…

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