[tor-relays] Does fallback directory traffic go over the ORPort?

[tor]

In another thread, Roger said:

> Note that most clients use the ORPort for fetching directory stuff, and
> that's heading towards "all clients" as people upgrade and stop using weird
> configurations.

I'm curious about the 100+ fallback directory mirrors. Does fallback directory traffic go over the ORPort too? Is it safe to disable the DirPort on fallback relays?
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