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How do they know the load limit on bridges Dad? They drive bigger and bigger trucks over the bridge until it breaks. Then they weigh the last truck and rebuild the bridge. Oh. I should've guessed. Dear, if you don't know the answer. Just tell him!
Calvin asks how they know the load limits on bridges. Dad tells him they keep driving bigger and bigger trucks over the bridge until it breaks. He tells Calvin they then weigh the last truck and rebuild the bridge. Mom tells Dad that if he doesn't know the answer, he should just tell him.