Does this mean it turned fully around or just turned (e.g. turned left, or something)?
That sounds rather like a slang-like phrase. "Round" is a shape, "around" is a movement.
The pedantic part of my brain pictures your sentence as the vehicle suddenly taking on a spherical shape.
edit - Okay, I looked into a dictionary (which I really should do before commenting) and, foremostly in British English, it seems to have acceptable use like that. Very fascinating.