I always prefer this road when I go to İznik. Road is quite narrow and there are lots of good corners. It has also some hairpins. Surface is not best but it is ok when you compare to other rural areas of Turkey. You will have Lake İznik scenery from the top if you come from Karamürsel side. From Boyalıca, continuing to İznik is a must for eating in Köfteci Yusuf. You will see lots of motorcyclists there.