NH7 (bangalore to salem) is completely four lane now. I have been able to consistently do bangalore - salem(200kms) in 3hrs 15mins.
Driving the Krishnagiri - Thoppur section is a bliss now. This road section is build and maintained by L&T. Rs 48/- is the toll charges for cars. They have user amenities like restrooms, emergency communication systems, patrols and ambulances available at the disposal.