Why are there values for invalid O-D pairs in my Metrics?

Trips are analyzed if they start in or initially pass through the Origin Zone and then if they end in or subsequently pass through the Destination Zone. With Pass-through Zones, this can get tricky as there is no restriction that the trip only pass through the Zones once. We usually see "invalid" O-D pairs with Pass-through Zones from highly circuitous trips such as those from TNC vehicles (like Lyfts and Ubers)

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