Night bus to Jaffna for Nallur - AC or non-AC and do solo women actually get a seat that is not a story

Buy a named AC intercity (the big private coaches / CTB AC where they run) from the proper stand, reserved seat if they sell one, bag in the hold with a photo of the ticket. Sit near other women / families if you can. Non-AC night is cheaper and more stop-and-start. Harassment is not the default on the Jaffna AC; it is also not impossible. Headphones, aisle if you want an exit, say no once, change seats, tell the conductor. Do not take a "friend's van, same price".