People who wish to travel with their own vehicle fro districts to districts or from state to state have to apply in this link https://tnepass.tnega.org/#/user/pass

if you want to use government transportation for travelling to other states from tamilnadu then you have to apply in this link https://rtos.nonresidenttamil.org/

if you want to return from other states to tamilnadu , then you have to apply in this link https://rttn.nonresidenttamil.org/