FASTag is an electronic system for toll collection run by National Highway Authority of India (NHAI). The system works on the Radio Frequency Identification (RFID) principal that allows making toll payments online from prepaid or savings account connected to it. FASTag lets you pass through the toll plaza without stopping for the cash transaction and automatic deduction of toll charges.
Anyone can buy this tag from the authorized distributors like Eckrox Solutions in Punjab and recharge and top-up as per their requirements. There is a 5% cash back on using FASTag offered by NHAI and the special lanes created for this at some toll plazas.