Hmmm... I'm not sure what to call him, but he certainly follows the spirit of ethical vegetarianism. In this case, I'm not that concerned with labels.
One can argue that he is denying natural scavengers of a food source... this may be true, but I don't see how this is really that different from a vegan's garden occupying space that some animal might have used to forage for food. We have to eat something, and the cool thing is, he's not killing animals for his food.
My only concern is that the meat he eats might not be sanitary. I think road-killed animals are a bit more likely to have been diseased; healthy animals are generally more alert and faster than ill ones, and are better able to avoid cars. True scavengers can handle such material, but I don't know about humans...
Peasant (1963-1972) and Fluffy (1970s?-1982- I think of you as 'Ambrose' now)- Your spirits outshone some humans I have known. Be happy forever.