If you moved it to a secondary, then fermentation should have been complete before you racked it. A secondary is for bulk aging and clearing a beer. Unless you added fruit or aditional sugar then no fermentation should be happening.
So there's no reason to worry about anything happening or not happening while your beer's in secondary except it clearing and conditioning. So unless your place is going to be freezing there's nothing to worry about.
If it's below the flocculation temp of whatever yeast you're using, then the yeast is just going to further drop out, just like cold crashing.
Relax and enjoy the trip.
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