Chapter 1
The birth of a concrete giant
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Chapter 2
The secret code of the roads
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Chapter 3
The heavy toll of progress
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Chapter 4
Life in the fast lane
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YOUR GOAL
Master of The interstate highway system
Ch 2 · The secret code of the roads
sloane Interstate Highway Numbers
If the Interstate starts with an odd number, It's a spur, but an even one's a loop, you discover!
Fun Fact
Mile marker zero: Most interstate mile markers start counting from the south or west border of each state.
Quiz
What is the main design feature that distinguishes an interstate from a regular highway to ensure high-speed safety?
Quiz
Why do engineers often choose concrete instead of asphalt for busy urban interstate highways?
Quiz
What safety feature is built on steep mountain interstate descents to stop out-of-control vehicles?
Quiz
What does a three-digit interstate number starting with an even digit, like I-495, represent?
Quiz
In the US interstate numbering system, which direction do odd-numbered highways like I-5 and I-95 run?
Quiz
Where would you find the lowest even-numbered interstate highways, such as I-10, in the United States?