Have tried to do a search but didn't get any hit. (if it has been mentioned before, please remove this post) I sometimes get glitching car bumpers on distant cars in both single and multiplayer.
Sorry, glitchy might be the wrong word. Flickering might fit better, and it's not the whole cars. Only the bumpers and parts of the trunks that disappears and appearing rapid like on a broken, flickering lamp. Happens when they are in the distant. So the tracks I can say I have noticed it when I think about it, is on the long straights on Nûrburgring and Bathurst.