Got my first ticket last weekend for driving at 73 kmph on outer ring rooad (just after hennur road junction). I am not sure they have put any signboards stating 60 is the limit on outer ring road. And the rational for traffic personals seems to be to make more money than control and educate the masses on driving faster. I have done 150 kmph on a 2 lane state highway and no-one seems to care on that but a 70+ on a 6 lane road seems to be a problem :(
My max speed has been 165 on chennai highway – closer to Vellore and in Bangalore – 150 (Nice Road) and dodballapur State highway.