Once you cross all the hairpin bends you'll be driving rest of the way on NH 44 back to Bengaluru.
How to Reach:
There are two routes of going to Yercaud. One is via Salem while the other one is which I took via Kadayampatti, Danishpet and Kanaivadapur. It's about 220 km one way and there are plenty of restaurants along the National Highway which can serve your basic food necessities.
However I wouldn't recommend taking the off beat route if you are traveling by car. the roads are pretty narrow and you won't be able to find any help for kilometers if your car breaks down.
Duration of trip:
It's advisable to make it a 2 day trip rather than trying to cover 450 km in one day if you are going from Bengaluru. Although the places to visit can be covered in a day but still covering that much distance in a day is not advisable.