My first rating will be always with the A2B for an excellent veg foods. A2B is present in Sulagiri[near Hosur], Dharmapuri[Immediately after thoppur toll], and in ulundhurpet. If you are crossing Vellore, Dont even think of missing Hotel Saravana Bhavan[HSB]. Between Krishnagiri and Vellore, Near vaaniyambadi, "Chola The Hotel" will be a good option for Breakfast. "Highway Motel" at sriperumbudhur is a good one except for LUNCH.[Please don't try.!] But the dinner and Breakfast will be excellent. Between Salem and coimbatore, you will have good hotels at Avinashi. "Aavin" milk booths after Salem will contain Curd rice and occasionally Variety Rice.