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What did they think was going to happen…
(sopuli.xyz)
People walking between the bus stop (outside the picture) and the building (on the right) don’t like taking the long route around this huge green circle. It was pretty obvious that this would happen sooner or later.
The "grammatically correct" way is always whatever way is already in widespread use. Also, I'd say this is a noun adjunct, so not all that uncommon.