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To expound further on the numbering system: If the first of the three numbers is odd (1, 3 etc), it is a route into a city. If the first number is even (2, 4 etc), it is a beltway or loop around
Additionally for both 2 and 3 digit Interstates, if the last number is odd, it is a North/South highway. If the last number is even, it is East/West.
And, the lower numbers (East/West) cross at the Southern latitudes and get higher as you go North (ex. I8, I10, I40 etc), while the North/South numbers are lower in the West and go higher as you go East (I17, I81, I95 etc).

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