One of the best roads near İstanbul for corner lovers. Road surface is nice. Watch out for dogs. There are too many dogs around the road. There is one really tight corner after a long straight. Be careful for that :)
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.
Very nice scenery at the top of the mountain. You climb up nearly 1800 metres, then down.
I think this is one of the best roads in Turkey. Great corners. Road surface is better than average of Turkey. Traffic is also low.
Very nice corners and a good scenery of marmara sea. The only drawback is it's so short.