Hi anand, I had been to devarayanadurga last month. I had taken nice road and then the tumkur highway. The highway is really smooth and I didn't face any issues apart from the toll booths where it was congested due to the traffic. Once you take a diversion from dobbaspet there wasbsome road widening going on at a few places. You might come across these or maybe they would have completed the work by now. Hope this will help you. BTW
I had gone there in my Scorpio.