Credit to u/ricodued
Auxiliary interstates split off from main interstates and have three digit numbers (e.g. I-405) and do not obey the north/south-east/west rule of main interstates. If the first digit is odd, it is a "spur" route and does not return to the main interstate. If the first digit is even, it is a "loop" route and will return to its parent interstate.
LPT: odd numbered interstates run north/south, even numbered interstates run east/west.
![LPT: odd numbered interstates run north/south, even numbered interstates run east/west.]()
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03:54
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