Battlefront's I don't know about, but I've used K&R's 15mm rubber roads with 28mm. They look OK for width; they're narrow roads rather than wide ones, obviously, but they don't look too under-sized.
BF's do have very distinct trackmarks which might not scale well though; maybe de-emphasise that with careful painting?
If you're not set on BF, you could look at Early War -- their roads are targeted for 20mm which would be less of a scale jump: they also have a variety of surfaces (track, cobble, tarmac) and interchanges between them -- I have some of the even smaller rough tracks and, although the ruts are a bit narrow, it doesn't actually look wrong for 28mm. The wider "open roads" range is very suited to 28mm.