What is the largest US interstate highway?

Answer:
West and East: 1. I-10 2. I-40 3. I-70 4. I-80 5. I-90 6. I-20 7. I-44

North and South: 1. I-5 2. I-15 3. I-25 4. I-35 5. I-55 6. I-57
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