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[Quillz]

WA-102 was assigned in 1984, nearly two decades after some related routes like WA-104 and WA-106. Is there a reason why that number was skipped over in the 60s? Or was there an older WA-102 that was deleted? The present route is very short and doesn't seem very significant.

[NE2]

110 was also skipped. Maybe they set them aside for something related to US 2 and US 10? Or they were trying to space them out and keep directional parity? Many odd 5xx numbers were skipped for probably the latter reason.

[Quillz]

110 was also skipped. Maybe they set them aside for something related to US 2 and US 10? Or they were trying to space them out and keep directional parity? Many odd 5xx numbers were skipped for probably the latter reason.

Does make some sense. The branch routes do respect directionality for the most part. WA-106 and WA-112 run west-east, while WA-113 runs north-south. Although based on how the numbering works, US-2 branches should follow a 2xx numbering scheme. But I'm sure there's probably a lot of inconsistencies there.