Just an update, the diversions are worst on many stretches.
1. Between Hosur and Krishnagiri, road widening is happening and there are few diversions. At some places, no signs of diversions warnings. Be aware will driving early hours or late night. Some place lanes are not marked though road widening has done already.
2. From Perunthurai till Coimbatore. There were many diversion and vehicles runs in all directions on both lanes. Be careful, somewhere the roads are not laid properly, there is a hump like structures at many places which are not marked, but you can see a 30KMPH warning boards.
3. I get confused, because I was driving in a wrong lane (opposite direction - Right hand side of road) for a long distance because of diversions boards. And few vehicles were driven on left lane too. Was bit confusing.
4. There are few places where road ends, you need to take a U turn and drive on opposite side!
Please avoid driving fast. Try to drive in daytime, if you are not aware of the rooad conditions here.
Safe Motoring.