Tamil Nadu's port traffic from Chennai and Ennore, plus the NH 44 and NH 544 corridors, keep commercial toll volumes high year-round.
These are the tolled routes most used by Tamil Nadu vehicles — all of them run on FASTag:
New FASTag issuance for every vehicle class, instant recharge across all NETC banks, KYC and re-KYC, replacement of damaged or blacklisted tags, status and balance checks, the NHAI annual pass, and e-challan lookups — all for Tamil Nadu vehicles, mostly over WhatsApp.