أن تكون على هامش الأمان، يعني أن لا تحاول قيادة شاحنة بوزن 9800 رطل فوق جسر قدرة تحمله: 10000 رطل. لكن أكمل الطريق قليلاً وابحث عن آخر يقول بأن قدرة تحمله 15000 رطل.

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