A newly completed bridge covered in rows of giant water bags isn't an unusual sight — it's a mandatory load test before opening to traffic. Design calculations specify load capacity, but physical verification requires applying real controlled weight to confirm the structure behaves as engineered. Water bags weighing several to over ten tons each are positioned precisely and added gradually, with instruments continuously recording deflection and stress changes. Trucks can't be used because dynamic forces from acceleration and braking create uncontrollable data fluctuations. Static water weight is instantly removable if readings go abnormal — protecting the structure while confirming it's safe. Pass the test, open to traffic. Fail, investigate before a single vehicle crosses.
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