is a very erudite study which does not rule out the possibility of crows using vehicles in this way, but suggests that they only drop the nuts on the road to crack them.
However, at the Ragihalli sheet rock area in the Bannerghatta National Park, on 21 Oct. '17, we observed a Jungle Crow which definitely seemed to use the oncoming vehicles to crack the tamarind seeds that it was bringing, and then going to the road to eat the exposed soft tamarind.
Here's the crow, which deliberately (and fearlessly) the crow leaves the seed pod and flies off only when the vehicle is almost upon it.
Here, the crow flies in after the vehicle has passed. You can clearly hear the excellent description of the crow's behaviour by my friend Aishwary Mandal in the video.
Birding is not "ticking off" birds that we've seen...it's also watching and learning more about the feathered creatures around us...sometimes they surprise us with what they do.