How to tell if a node on a highway has coordinates on the actual highway?

So I’m making a project that requires knowing the particular geometry of highways (roads), and I’ve decided to pull the data of nodes that are on the highway, particularly their lat/lon. However, I’ve run some tests and realized that some nodes are not marked on the road itself, but rather on an adjacent building. I have looked for tags and such things that may help me differentiate between these nodes and the ones that actually describe the road geometry, but so far I’ve come up empty. Is there actually any way to do this?

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