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It's hard to tell. Beside the truck pruning, that's sure. The strong air flow extremely turbulent at close proximity of the passing truck doesn't make for a quite growth, even without direct contact.

I saw a study at ground level, in a green house. I don't recall the specie(s). They found that the tip's growth can be inhibited by a mechanical contact, then kicks in again after a little time. Say a hand's sweep for example, not a hammer blow ! A repeated contact between the crowns /limbs by...