Private buses and those of Tamil Nadu State Transport Corporation (TNSTC) plied from Sathyamangalam (in Erode district), Tirupur and Coimbatore to Mysuru via Chamrajnagar from this afternoon, police said.
In Nilgiris district, about 100 lorries crossed into Karnataka from Kakkanalla checkpost, they said.
A few lorries with Karnataka registration numbers besides cars and other vehicles were provided police escort up to the border, in Pulinjure.
However, as a precautionary measure, buses with Tamil Nadu registration are being operated till the Karnataka border with police security.
On September 12, protests over the raging Cauvery water sharing dispute between Karnataka and Tamil Nadu turned violent with incidents of attacks on buses, trucks and hotels.