Southern Terminus: US-277/OK-19, north of Cyril

Going southbound, as we are in this picture, there are no more assurance signs for OK-8, only for US-277 & OK-19, suggesting that this is the terminus point. Coming from the other direction, however, the first OK-8 assurance sign actually appears within Cyril itself, a mile down the road. As it happens at a mere turn in the road, however, and not at any specific intersection (may look like a T-junction, but the third leg is just the entrance to a company parking lot), I'm more inclined to believe the intersection above to be the actual terminus point.

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Northern Terminus: Kansas State Line, continues as the southern KS-8