I think that this illusion is based on low-contrast change when brighter bus moves in to a brighter stripe (and vice versa). Your eye can’t tell yellow from white as much as it can tell blue from white. If you’re driving on a non-striped road that doesn’t work.

But I’ve read that if you look at a darker car moving at you, you’ll perceive it is a little less threat than e.g. red or neon-colored one, because dark contours “grow” slower. (Similar thing, but can also be a stereotype bs, learned lots of these before debunking via internet era came)