Daily Facts & Reels. on Instagram: "If it doesn’t bend, it breaks. You are watching a Dynamic Load Test in action. While concrete feels solid to us, bridges are designed to be elastic. This sensor (likely an LVDT) is measuring the “Relative Slab Movement” as a heavy bus passes over the joint. Engineers track this displacement to ensure the joints are working correctly. If the bridge were perfectly rigid, the stress would cause it to snap. Flexibility = Safety."