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Actual traffic to articles; thanks to Wikipedia article traffic statistics we can now measure this much more thoroughly. Off highway vehicle received 550 hits last month and 892 in the first three months of the year.[3] By comparison, overhead valve received 4762 last month, and 12842 since the start of the year;[4] I'd say that's a sufficient order of magnitude to suggest that as per WP:DAB, the abbreviation should redirect to the primary use.
There are only two articles; we don't even need a disambiguation page when a hatnote serves the same purpose.